Malicious PDF — malware analysis report

Static analysis result for SHA-256 99872d8c7f9a99a3…

MALICIOUS

PDF

77.6 KB Created: 2021-03-20 12:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d6b31cd07d5fe5bc99ad7ddaa9cbdb SHA-1: e1fbae5d45ea1bad706df108be43f9ecee77794b SHA-256: 99872d8c7f9a99a3eab4e236302ba9d62ceb3ffc1d296f0e3f3da85fe5aa9fa5
206 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or link farm attack, indicated by the presence of numerous external links and a ML classifier flagging it as malicious. The document body, though heavily obfuscated, contains references to financial institutions and technical terms, suggesting a lure. The heuristic 'SE_CALLBACK_LURE' further supports a phishing pretext, likely aiming to trick users into interacting with malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/strik?utm_term=selfreliance+federal+credit+union+warren+mi
    • https://cdn.sqhk.co/wenoxavawo/QkoGidp/gonawozisu.pdf
    • http://cardioactiveuficiale.site/51648299978m3mhx.pdf
    • https://motedozanegiraz.weebly.com/uploads/1/3/1/3/131383309/9714860.pdf
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/9271164.pdf
    • http://tradebot.space/jewaxijufuxorojatirupioaecn.pdf
    • https://cdn.sqhk.co/kuwafuwawen/gJify54/20249618898.pdf
    • https://cdn.sqhk.co/famagafe/jjdyjgH/duracell_rechargeable_aa_batteries_with_charger.pdf
    • https://cdn.sqhk.co/nakusunegud/jdy4mig/crossing_the_rubicon.pdf
    • http://fajiragudabega.iblogger.org/iksar_leveling_guide.pdf
    • https://cdn.sqhk.co/bajafigotuvi/jeezidj/97431032382.pdf
    • http://ch-redirect.icu/327551283887sbf1.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/497869.pdf
    • http://lyudi23.ru/jogumojalobovp2ly.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jenagubadopi/what_is_difference_between_nvl_and_nvl2_in_oracle.pdf
    • https://s3.amazonaws.com/muwomapotumugi/32062307560.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_1c60f5b182ab4a269d842da5634e94c3.pdf?index=true
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_6bfd2883d3f44894bcb46e2ea654368f.pdf?index=true
    • https://s3.amazonaws.com/gotijejaj/14427510043.pdf
    • http://ditinalozevid.epizy.com/64577358193.pdf
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_fde30ee6c021439ebb2d696ead71b38a.pdf?index=true
    • 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_off0000f1bb.bin
6884914f0168050fbda8ccafdc998cf7c75ccfa5df49562bf201340080c21be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 5184 bytes
font_01_sfnt_off0001035b.bin
de76d88a8250784b6f144a6399a919637927363d9d35bc7e84a760e82eb3ae29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 10996 bytes

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