Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2281f42f4efb19…

MALICIOUS

PDF

71.4 KB Created: 2020-12-17 15:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0349e0442d9361d8ec3176118c7be650 SHA-1: 2ca08066b2008940bdb0d5d873625624e3e73278 SHA-256: 5a2281f42f4efb19404d029ff73608ebcbce27ebf44cf66c6bd32ae20361981c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?utm_term=possessive+pronouns+examples+pdf PDF link annotation
    • https://nujodobenume.weebly.com/uploads/1/3/4/4/134441993/nifadenasibaker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5faf036673387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8a1d0cb7eba.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/supamitiwojaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fc4821c8cdf6.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/4566286a16f.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/8a81413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_5f9541947f92b.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://static1.squarespace.com/static/5fc28ae3ec917750a3e23ff5/t/5fd0a8310c0c9b10ab0d5264/1607510065256/jump_over_the_moon_watch.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf1a53f75b166439a3b74/1606283685618/kebobifarusowilu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0672f60f2895dc1e54ab2/t/5fcc3b2b9aa2de0c648623dc/1607220012157/41566136572.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29c05a3bf4b14abb4035c/t/5fc6303e2dd96f5918bfdd5b/1606824000117/lunitukovalutiferipozu.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/4th_grade_rocks_svg.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/1617307470.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 5120 bytes
SHA-256: ee1fc752dcff4cc8d38316e23278ebf022a60630a5decc658f3b5a69fcabaf92
font_01_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 10776 bytes
SHA-256: 63c3c9736b5c16969212b0e2a47711e483b3d834590911962db6652226192c7b
font_02_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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