Malicious PDF — malware analysis report

Static analysis result for SHA-256 686898edb576b3e3…

MALICIOUS

PDF

83.5 KB Created: 2021-02-27 08:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 10fedd62cfb5fa2946abdf7ae79641a0 SHA-1: 4c97249d3a98bb3c1321e4038c0cd41a38ebaed2 SHA-256: 686898edb576b3e3fed4c5f930a9d0ebee7280e6f1cb15e7783748186771f363
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with several heuristics flagging it as a malicious redirector and a link farm. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to lure users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://yafferge.ru/wix?keyword=america+the+story+of+us+heartland+fill+in+the+blank+answers In PDF document text
    • https://cdn.sqhk.co/rinugezig/Xjjiiic/the_elevator_shaft_escape_room_review.pdfIn PDF document text
    • https://radokixudex.weebly.com/uploads/1/3/5/3/135342076/6374537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450631/normal_5fcff5494794b.pdfIn PDF document text
    • https://cdn.sqhk.co/nasonamav/hbXijhB/missouri_highway_patrol_most_wanted.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_60262dea839bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_602c395b95e21.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/gg2iaid/4524052751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366364/normal_5fe57d97ae76e.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/9VnibpV/86262662716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5ff531ed07b62.pdfIn PDF document text
    • https://cdn.sqhk.co/tujuvemevo/eigieDx/46972547378.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gebukil/ny_giants_injury_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/memikalifupo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 5532 bytes
SHA-256: 9a27cb4b71a2f540f5812d10aa13dd87ff7bd43834b7e0f7495802d510c691d3
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 10476 bytes
SHA-256: a2d037d5c25544d916ce66d5a648511dd6836427df10d80d8fc40acc01920fc6
font_02_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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