Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5dcca743e4d046…

MALICIOUS

PDF

75.8 KB Created: 2020-12-19 08:37:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 36074a832821d3563786a88149f8e5c8 SHA-1: bfe347587f33ead1a679646c4474efb0abfc1773 SHA-256: ec5dcca743e4d046b09b979868dd723d67c4019e7674a7a11dc3a42daa9f71ee
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing lure or malware distribution vector. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://cctraff.ru/strik?utm_term=illinois+air+team+schaumburg In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5fdb98325361c.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/9008401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_5fd8c67249641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_5fbf31fda4d0b.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/7198733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fa5782eead1c.pdfIn PDF document text
    • https://benoralegofalaw.weebly.com/uploads/1/3/4/5/134581061/6457233.pdfIn PDF document text
    • https://vaxuzumop.weebly.com/uploads/1/3/4/8/134870956/f11d80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f894e69dd785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee473570fb44d1c7f59d/1606282824967/classical_music_instrumental_love_songs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe327b7acac6192a8b377b/1606300285591/shel_silverstein_poems_where_the_sidewalk_ends.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1aa40d26ff1194f791695/t/5fcb0a610814be4f73e28853/1607141985881/download_ejen_ali_emergency_mod_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ceb4b0-0c26-46cd-a209-a6a2a18ee722/space_saving_bed_sets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f27ea13a450babf44921/t/5fc20faa645712565483bc58/1606553515049/27843616525.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/cash_money_g_app.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_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 5288 bytes
SHA-256: 55c5df8096d5e40445e5759036476e6838d506eace1aed0e4cd103eac3d3742e
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 11108 bytes
SHA-256: d81cac72583fe1cf7c2b649d5da1b386dc89205c36a83602233fba193f4563d7

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