Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b7a58e735a61b2…

MALICIOUS

PDF

71.5 KB Created: 2021-01-01 04:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d03bb6186d501ab6ed699cdb79571726 SHA-1: 46ecb1be5d1050ef02a5f15e8f500c268a6aab2f SHA-256: 21b7a58e735a61b277083ea9c1cdce33e69df52a7ade70441cca1197e38d6c98
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or distribute malicious content. The ClamAV detection and ML classifier further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffking.ru/123?utm_term=when+to+harvest+carrots+in+georgia In PDF document text
    • https://cdn.sqhk.co/zesunotu/JnGiaFK/tixazis.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/kojiworibiwiv.pdfIn PDF document text
    • https://lamuwibosuzo.weebly.com/uploads/1/3/1/0/131071033/91ad19be2c.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/d6d4d8a0-b6a7-4d2b-a1f5-cc98faaaff5f/pazipuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681c28f7-f5fd-4b92-81b7-a6b2e3495c3e/4th_grade_math_study_guides_common_core.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41bb72bd-4abb-47cd-ad7c-b10c28bdaf92/what_is_ashy_bines_clean_eating_diet_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42bbffd9-102e-4c6c-8065-09ebafc9974f/9.1_angle_relationships_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af709a39-0a28-472e-91cb-c0252556bbdd/italy_travel_guide_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af990325-d64c-4510-9c2b-c50bf66652f1/mebuzoponanubizem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03eb88be-593e-40ad-b21c-1f0f5b061071/92485535060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10c7d7f-0769-4386-816d-bc293acb086c/6050976859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a9f7df-2570-4f1f-9a91-fa048f48e4b2/nilademut.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 5100 bytes
SHA-256: d84e2065166f40a4c332a83f482acb3903879d1cab1368c24b0f45820d04b8a2
font_01_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 10272 bytes
SHA-256: 275f55b16f9d895478f7e076db8df416e27797dc75042e24cb822f020b0c059d

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