Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ef1afe07bfbca3…

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 19:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b4aebc7e1ae4d3b513ce1eb750129e03 SHA-1: b3385b2b79ba3c48f10f17a67479b02646e705bd SHA-256: c9ef1afe07bfbca31d39f1ec4277958d311fe6a90a7ff3816b0261a9eb931db1
186 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 0.9998

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
  • 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.
  • 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://soxebez.ru/aws?utm_term=data+science+degree+online+australia PDF link annotation
    • https://cdn.sqhk.co/pafevola/ex7jiKR/batman_the_telltale_series_review_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_602c9428e6e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5fd3b78cc0ede.pdfIn PDF document text
    • http://pikezulewapuz.iblogger.org/3208928218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_602446b794315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60357702c5725.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/Y3nHtgf/bitmango_mahjong_solitaire_classic_quests.pdfIn PDF document text
    • http://faxobasom.22web.org/67760998864.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/gf2jjjj/47221292738.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_673cff1fdec74bde8dfde1611c305df4.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_19e0eb797cff4dffa83bd985e2cbf8b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/96726959817.pdfIn PDF document text
    • http://vubixegigag.rf.gd/happy_sunday_images_in_tamil.pdfIn PDF document text
    • http://juduboferota.epizy.com/91880246440.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/lugozinizojapetoko.pdfIn PDF document text
    • http://zarazemudaseri.epizy.com/fogerotavidi.pdfIn PDF document text
    • http://bolapapuziku.epizy.com/lopelefagidid.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/34461074187.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/47921896487.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_29fa8f3561b346eeb9031a4858321818.pdf?index=trueIn 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_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 5104 bytes
SHA-256: cc3ddee8ee64f37fceab5ed13db5a112ad8249988d60e09589a2011bf3f30731
font_01_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 11084 bytes
SHA-256: 100907e0da40e0d839bf1cf7f8e19a6dc0fd3628dce20c0761c5b36acf89b8a4

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