Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad479ecc5288cf1…

MALICIOUS

PDF

74.9 KB Created: 2021-04-16 23:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b45b923ecb811a021cb826b856cd59b8 SHA-1: dbb0fa827734b9bde7686ded01adb6fda61f4ed7 SHA-256: fad479ecc5288cf1b77a1086cbed933d3efc6105843f275ba7d8d6272fe53ee4
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://seumenha.ru/strik?utm_term=json+convert+c%2523+example PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5fff62d736812.pdfIn PDF document text
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/fasevikufiloxogak.pdfIn PDF document text
    • http://magabof.22web.org/breatheology_stig_severinsen.pdfIn PDF document text
    • https://patajarixeli.weebly.com/uploads/1/3/1/0/131070073/tepexepes-woravepivumux-niwuw-volozurunesakix.pdfIn PDF document text
    • http://teaitalis.space/accounting_salary_guide_2020p6hsf.pdfIn PDF document text
    • http://japadalifu.22web.org/netelapofegil.pdfIn PDF document text
    • http://sadovik.me/periodic_table_crossword_puzzle_answer_keyzoq47.pdfIn PDF document text
    • http://afracheat9.xyz/41123933353p5cxw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_604eef5d05628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zokivobadid.rf.gd/annadurai_movie_songs_kuttyweb.pdfIn PDF document text
    • http://rixuzomobe.epizy.com/67464618361.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_130a7d2a1eb743598f7406b6f9e550fd.pdf?index=trueIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_6a9fdefd7dee45f88ca826ab5d1e246a.pdf?index=trueIn PDF document text
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_ea6a105db0d240098c696bf31a064e20.pdf?index=trueIn PDF document text
    • http://sezulezaba.rf.gd/dexopod.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_02d10385b6ae416baf224d2e9d371853.pdf?index=trueIn PDF document text
    • http://rujolur.rf.gd/84973092572.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_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 4600 bytes
SHA-256: 8e37f1fa2d9eaf6dfa4f4cf9f59bc8f12fef763a8017e7cd97d7aafab1b30a9b
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 10864 bytes
SHA-256: b2b5e66e0038882ce4f9088c9c298796fd75ead018556905a22c834131618cdd

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