Malicious PDF — malware analysis report

Static analysis result for SHA-256 75677371e9b24779…

MALICIOUS

PDF

72.8 KB Created: 2021-03-24 12:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9d4120b16bb2fd7cfed9848d30b3934 SHA-1: d0281f324d44973c9744b723d5f1a7cb78152a10 SHA-256: 75677371e9b2477994b04e90ff2aa4e9aa072073939ee42f2bf2d85b13023518
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains text related to a Minnesota state high school coaches association, likely used as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://resalured.ru/wix?keyword=minnesota+state+high+school+coaches+association
    • https://cdn-cms.f-static.net/uploads/4453102/normal_600c54e305a69.pdf
    • https://cdn-cms.f-static.net/uploads/4478125/normal_602b6c4987d6d.pdf
    • http://komomutuba.22web.org/bukhari_sharif_in_urdu_jild_1.pdf
    • http://kajipim.mypressonline.com/fadomusularijetolotetug.pdf
    • https://static.s123-cdn-static.com/uploads/4486034/normal_6002e6cdb690d.pdf
    • https://cdn-cms.f-static.net/uploads/4417809/normal_604a93becf7f5.pdf
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5ffcb9c31a3b4.pdf
    • http://jedilinosur.mywebcommunity.org/sapidetowabunenevija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_ad1395205c5044d8a46cc067c971961b.pdf?index=true
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_3e0d5322a38f46198a3d43d5ea5d2396.pdf?index=true
    • https://uploads.strikinglycdn.com/files/107ded3b-665d-450f-9093-96f856a3526e/famizanewugovalenoxorota.pdf
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_62d1ec6658d14db3b3319e7210ddc5d4.pdf?index=true
    • http://gonumarimemax.epizy.com/instagram_likes_apk.pdf
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_daaa578268dc4744b1658de19835514c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/791adf68-815b-4741-bf31-3f53fa530852/english_phonetics_and_phonology_peter_roach.pdf
    • http://zefavobam.rf.gd/bookcase_headboard_platform_bed.pdf
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_1dd1804260064fabab2c434a4139b5aa.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_97185c0e6c40487bbdd4d2c6fd8a41b1.pdf?index=true
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_94c009fb4ef04936be6e970da10583bc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e57d856-e6f0-4c6a-8946-e0bfd94e76ff/black_and_decker_leaf_hog_bv4000_type_2.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_off0000e2c2.bin
25984ac8326bb18e67d73cdda1faac8f876ccbb9e34486296ebc308f43bfaab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 4972 bytes
font_01_sfnt_off0000f3b6.bin
135b37bf2568b0c615fb0b20a992fd4e235b8286f1472d9484c7621da22e7883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 10048 bytes

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