Malicious PDF — malware analysis report

Static analysis result for SHA-256 8834f52f1386dec4…

MALICIOUS

PDF

83.0 KB Created: 2021-03-17 21:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c9b8d5543ca5445f4d5c5f541601432d SHA-1: 340ac706762c395a046795fa964787b89a591f7d SHA-256: 8834f52f1386dec438a94d2de7bc5cb0a8b19f38aa6ce84756a5bb463d7c3275
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the presence of numerous external URLs indicates a potential for redirecting users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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/wix?keyword=1996+sea+rayder+f16+owners+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5fd89f79a682f.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/jipokirolinufam.pdfIn PDF document text
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/rirejuxof.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/9106020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5ff8c0c635c17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460968/normal_5fcb535db58b1.pdfIn PDF document text
    • https://zamivevi.weebly.com/uploads/1/3/1/4/131437513/716ca.pdfIn PDF document text
    • https://rurefisofe.weebly.com/uploads/1/3/5/3/135325463/6530130.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/english_grammar_tenses_table_free_download.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/excel_vba_check_for_type_mismatch.pdfIn PDF document text
    • https://lidisujuv.weebly.com/uploads/1/3/4/5/134515282/6245181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5fdc580fd89eb.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/banoxipepax.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/silukuzejavobe.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/b21f51c4-43c0-4e81-86ad-3892ea233e27/8491573102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86acbbb7-f42e-4701-8716-43bf309ac214/xakalosenunowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f49ca1-8c80-47ce-992f-85f88bb7ca7d/75944711119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23de1e2-607a-436f-a8df-dbc5a0017897/desilitunenajerafoduxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61fec5a8-1902-48df-a4f9-68ead59a1c25/92223630800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce60a20-1a10-469d-a19a-2170afa547c5/75613318917.pdfIn PDF document text
    • http://sovogezo.atwebpages.com/geroxavulivumova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494f57b1-786e-4109-9a16-cd3352d80f78/sportspower_brookside_wooden_swing_set_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b84815-07b0-4d35-b9dd-ae5887bb1d22/how_to_hustle_and_win_download.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_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 5512 bytes
SHA-256: a33f4d97f871b5fdde77eeee6893044180d669e6806e67552e97614bde604e39
font_01_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 12600 bytes
SHA-256: 8ec9599636b30acbaac995bd4d9086785f4f4b2ec41c7e018858897686102ca7

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