Malicious PDF — malware analysis report

Static analysis result for SHA-256 904ca0a576d0399d…

MALICIOUS

PDF

77.0 KB Created: 2021-03-04 10:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0a9ed7baaebd8a89d5f93d3a4456655f SHA-1: 313a46b1444dcff407204caf44a81093ff9556bd SHA-256: 904ca0a576d0399d85f6624b410624be294ee3eca5903cd367daee04d046bfcb
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://xezojetit.ru/wix?keyword=cherry+peppers+stuffed+with+prosciutto+and+provolone PDF link annotation
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/merotisajo-metol.pdfIn PDF document text
    • http://ek-arenda.ru/libro_heridas_emocionaleshiyua.pdfIn PDF document text
    • https://nutipofuvi.weebly.com/uploads/1/3/5/3/135310868/c1a7a0.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/darunev.pdfIn PDF document text
    • http://zebrait.fun/outlier_algebra_definition1s8vo.pdfIn PDF document text
    • http://apparentlyopt.com/self_introduction_speech_outline_templateb1614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5fdb121e472bb.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/xafaduv-vujexegidod-zafoxiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_602be766ae46c.pdfIn PDF document text
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/108f2a6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_5fd8594979974.pdfIn PDF document text
    • https://pumijisiror.weebly.com/uploads/1/3/1/3/131381241/fitagovarix.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/9820386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fc68302cb620.pdfIn PDF document text
    • http://edapog.online/chemistry_book_11ux38y.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/3911156.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
    • http://nasapatede.epizy.com/86436180697.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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 5400 bytes
SHA-256: 8431c664e185bc72eba3a7d9cb709ffd102b6c41e2465985acdbd0fdf00901b9
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 10120 bytes
SHA-256: e619d3d47152ef84ed0c914ff36682a368612106c6d1ce022fc2036d65e1082f
font_02_sfnt_off0001182c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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