Malicious PDF — malware analysis report

Static analysis result for SHA-256 004219d2310ae368…

MALICIOUS

PDF

84.9 KB Created: 2021-03-15 05:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 21f198522c914d2a1aec7091de598f56 SHA-1: 9a21750b3d80b6d80110d34904f46c329732c93a SHA-256: 004219d2310ae368562b5a816e8fb8d8b137db12230b293044fd9f042fa2a021
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to a suspicious URL. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external links, suggesting a malicious intent to redirect users. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector URL and the link farm structure strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=is+moroccan+argan+oil+good+for+acne In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379370/normal_5fcd712df2013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402745/normal_5fe05f7c07a70.pdfIn PDF document text
    • http://pupigojoniru.mypressonline.com/jukeluvodo.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/how_to_draw_a_face_with_charcoal_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_60379e936cc52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392661/normal_5fe5dba8ba53f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/57aded64-4017-4836-91c2-e760c621361e/vivulitejeniguduwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/209b26d5-67d6-425a-95e6-6272d7802a83/70845442338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27338731-bb12-4cd1-80c3-8f70d576237d/24022806784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2ed501-f132-4064-9c14-de82d4893014/61822289820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e29a26f-7633-423c-a5bc-000501af5789/kugibanuxizexodisegakof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01da084-6b27-4393-ae8e-70a580c9e121/how_to_replace_trash_can_lid.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_8d98916fa7f344a08b79b8a9ff978189.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32abb424-d5db-4488-afdf-7eca42d2dd35/49201118595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7c7339-5a0f-4ce3-92d5-0a0aeb87f739/zujabufavuropimu.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_247070f1e8254a5bbf3fd449688c962e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/297a21ff-5c5a-4896-bca0-a017ce0b86ff/8921321730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba93db2-9c92-48ab-82cc-55a2236654f3/46574104239.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_9574356707384ae7859a854827b08316.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_786252e7a0df4b90974e2f23c18ef11b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fd8a4c-26cf-4e57-9668-cc5181003374/a_level_biology_edexcel_topic_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f9dc4b-0182-487a-bc96-b1b55ac83f2c/47049075325.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 5276 bytes
SHA-256: 0c1242905231bc38b4adedd22961f3e9353cb386cbb91ecac113593fc2591888
font_01_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 11372 bytes
SHA-256: ec3dc2f969b2038e89306bbfc757ba18d8f17ae190e279d18a552c77b9056859
font_02_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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