Malicious PDF — malware analysis report

Static analysis result for SHA-256 34be3a11c5462aca…

MALICIOUS

PDF

62.8 KB Created: 2020-12-20 19:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c891298b428de15e195d75cb8c64799 SHA-1: c595355c8a88596ef1ccd2df96359a41dbb2a4e5 SHA-256: 34be3a11c5462aca1e2f59450a516d5ef3705e3b85a57555cf722e49fad9646f
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm, suggests an attempt to direct users to malicious websites. The document body, though heavily obfuscated, contains metadata related to a '2002 audi a6 repair manual', which is likely a lure to disguise the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=2002+audi+a6+repair+manual
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/rukanidud_tutezusawo.pdf
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fceea572c3f2.pdf
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/viwaj.pdf
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/sewofexito.pdf
    • https://rolewexuvuviwu.weebly.com/uploads/1/3/4/7/134742390/sapunap.pdf
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/labarowi_zonavizore_dokumo.pdf
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/sagovagukuwidox_kagikabiko_joleje_fofujonimikivi.pdf
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/898129.pdf
    • https://cdn-cms.f-static.net/uploads/4413702/normal_5fb2da210e571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9d9a995a-4ec6-4eb4-9667-6153edd7dd31/42865823345.pdf
    • https://s3.amazonaws.com/bovenotojitowe/beetle_bug_2_game_free.pdf
    • https://s3.amazonaws.com/kotenu/women_after_ww2_politics.pdf
    • https://s3.amazonaws.com/dowesitobuga/71402244722.pdf
    • https://s3.amazonaws.com/matogapibelifiv/xaxelevorazususa.pdf
    • https://uploads.strikinglycdn.com/files/96576d5b-8499-49b4-8f91-9024368ad65e/exercices_corrigs_paralllogramme_5me.pdf
    • https://s3.amazonaws.com/mufukep/jolatamirovom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b905.bin
77a608973b39d671102fa5582fabf9bd5dab7034d22bcec732dcdae0fa2ea025
pdf-font-stream PDF embedded font (sfnt) at offset 0xB905 5260 bytes
font_01_sfnt_off0000cac9.bin
1a479e9edec9d39694820fce3932bb465f7a440f36c671dcba31a5753601690a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 10720 bytes