Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cbbf11f6890b4d…

MALICIOUS

PDF

75.8 KB Created: 2021-02-14 05:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72c3d2e047f47220e741a4f15d09c1fe SHA-1: 973517b087ed68fc6a46e36793354a59dee6979c SHA-256: b7cbbf11f6890b4dc6f4853b531587395e3142ddb5a11e12f95eb37a9524601c
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO abuse. One of the extracted URLs, https://maypoin.ru/wix?keyword=camp+3+falls+merit+badges, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/wix?keyword=camp+3+falls+merit+badges
    • https://cdn-cms.f-static.net/uploads/4420902/normal_6014d8aac7847.pdf
    • https://cdn.sqhk.co/ranemagesoga/hicjdgd/management_skills.pdf
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5ff9053e76de4.pdf
    • https://cdn.sqhk.co/xezojutatow/ghfVieZ/94951571919.pdf
    • https://cdn.sqhk.co/metusoteliza/Rk5ii8K/cheap_online_shopping_price_in_china_2018.pdf
    • https://cdn.sqhk.co/pemejurove/hcUjaie/jobibabujasu.pdf
    • https://cdn.sqhk.co/rifusofuwedi/hidlhbe/koala_puffs_net_worth_2020.pdf
    • https://cdn.sqhk.co/famuxina/ajih1S9/sojilalulupenakine.pdf
    • https://cdn-cms.f-static.net/uploads/4375086/normal_601be27e2e187.pdf
    • https://rugomekedakore.weebly.com/uploads/1/3/5/3/135302214/famoje-tavegujukegujud-dofibi-xofitiwepiko.pdf
    • https://cdn-cms.f-static.net/uploads/4481695/normal_6027e5b623049.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jefazaxal/67744980562.pdf
    • https://s3.amazonaws.com/kefodek/architecture_colleges_in_tamilnadu.pdf
    • https://s3.amazonaws.com/bisazabe/37203278393.pdf
    • https://s3.amazonaws.com/vibasujefir/each_one_reach_one_free_sheet_music.pdf
    • https://s3.amazonaws.com/donarepemi/77225027011.pdf
    • https://s3.amazonaws.com/kasuwevovog/sapipu.pdf
    • https://s3.amazonaws.com/ninazarila/atal_pension_yojana_benefits.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_off0000e9bf.bin
f6e6203fc585d4d87d72e04ff6d09a3addcdb56abb795bffa540521403107732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5572 bytes
font_01_sfnt_off0000fc93.bin
e982916183d2416236d4ecfe383423798de20582ed9e6ed439934bd2f9ebc9ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 11040 bytes

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