Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf09479bdcdd422…

MALICIOUS

PDF

76.8 KB Created: 2021-05-11 16:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20a19ef592f72eaaa7739967f07f9f53 SHA-1: 8ec42bcfa4cc78b6f0696c8f96d49272507a5451 SHA-256: cdf09479bdcdd42241b6138e07d65b72708b7a522e2586f3c82db8930e4e4c7c
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 or phishing operation. The embedded document body text, though partially corrupted, includes a lure related to printer setup, which is likely used 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://xezojetit.ru/strik?utm_term=how+to+connect+hp+deskjet+1512+wireless
    • http://kinemulawaw.sportsontheweb.net/45319232504.pdf
    • http://joriwolujuf.sportsontheweb.net/59722877397.pdf
    • http://rupazaduxil.mywebcommunity.org/adding_and_subtracting_integers_rules.pdf
    • https://cdn-cms.f-static.net/uploads/4456686/normal_603c4648b43b2.pdf
    • https://cdn.sqhk.co/womibakok/ijTjhhb/backtrack_5_r3_for_windows_8.pdf
    • http://mofirixubutibi.getenjoyment.net/momojabewopej.pdf
    • https://cdn-cms.f-static.net/uploads/4500425/normal_601d4b2529552.pdf
    • http://rowexusaje.mypressonline.com/electronically_sign_free.pdf
    • https://cdn.sqhk.co/lepagesali/mjghczW/23396656765.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ce419959-236d-4487-89d7-67f356bda573.filesusr.com/ugd/147b51_01530c2f4f9f4486af6d299384899b09.pdf?index=true
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_731b682f5ff04c2da1ae0a3f4b796d90.pdf?index=true
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_8224cf72f6a1445cafeb698093f25d5c.pdf?index=true
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_ba2cfcd24c2f421b9066b8953495d1ac.pdf?index=true
    • http://nopawalaxuwaw.onlinewebshop.net/gobigefanibarokim.pdf
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_eedd5ac0b75a4bc39626bfa94860b73b.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_3695d4f39f4e4af5980ef5bf485874ca.pdf?index=true
    • http://lavoxema.onlinewebshop.net/awareness_about_tobacco_consumption_and_cancer.pdf
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_dd527bc6f5d04a58b0b090baf2d4ec4f.pdf?index=true
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_8ff4ded1a3c9418dabae81f1cb940213.pdf?index=true
    • https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_af63c762e6784e3c8d9736fe25e3be1e.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_off0000ee8e.bin
34bb5880f1e02f97d2d7ed79892c79b2bd4b13f295d8302a14187ddf5bed09d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 5452 bytes
font_01_sfnt_off0001013b.bin
43b4c3c6f6e1fd3361298a189d585484a842e81050d5dc7b4ad52089e2a64646		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10748 bytes

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