Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b54af7ca26acd3…

MALICIOUS

PDF

78.2 KB Created: 2021-03-16 09:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3404b97cbdb2cf8be842c6678974cde4 SHA-1: 9346270db9fbd687105a033c773aa380ec728df6 SHA-256: b2b54af7ca26acd314d657368f6ec3e84413e4476c899f7e9215a5c670caa561
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, a technique often used in SEO link farms to distribute malicious content or facilitate phishing. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext, although the document body is heavily obfuscated and does not provide clear textual content to confirm this. No scripts were extracted from this sample.

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
  • 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://jumiwimov.ru/wix?keyword=adp+flex+direct+login
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fe735813fecd.pdf
    • https://cdn-cms.f-static.net/uploads/4388841/normal_6046851c45127.pdf
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/2565037.pdf
    • https://cdn-cms.f-static.net/uploads/4481671/normal_60365d44e8d5b.pdf
    • https://static.s123-cdn-static.com/uploads/4391899/normal_6004b1c00b192.pdf
    • https://cdn-cms.f-static.net/uploads/4465127/normal_60261169d9eb5.pdf
    • https://cdn-cms.f-static.net/uploads/4389384/normal_601d2fb026d02.pdf
    • https://static.s123-cdn-static.com/uploads/4366316/normal_5fe085e4dfa7d.pdf
    • https://cdn-cms.f-static.net/uploads/4405654/normal_601003c82866f.pdf
    • https://cdn-cms.f-static.net/uploads/4368240/normal_601a9d43f1c3c.pdf
    • https://cdn-cms.f-static.net/uploads/4367941/normal_603bbc7730bef.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/meteniga_mepitekaviba_dejimiku_mafexapi.pdf
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/noxojope_lirojipod_wuvel_nugaligojol.pdf
    • https://cdn-cms.f-static.net/uploads/4446273/normal_5fd6c37789be2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rejeremonuwiz.rf.gd/addition_equation_and_conclusion_answers.pdf
    • http://jajowisomipuw.epizy.com/bacteria_cell_wall_synthesis.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd96.bin
d71b7ff59f7cf1a6d420d19e9d8eda5aec9e3412170884e0c9b143ed4632a7a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 4992 bytes
font_01_sfnt_off0000eeb2.bin
7434efa8bf7143d37bf4c3a4a208fbc8d645d86bc483c88e2278a44298a85748		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 11752 bytes
font_02_sfnt_off000116e8.bin
159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 16140 bytes

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