Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa51e5a9eb9aab77…

MALICIOUS

PDF

75.5 KB Created: 2021-03-24 02:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38694987132c81dc8e86235492405007 SHA-1: d8bbfcc87f2bc1f1cdabef5ac89a0deeff4d830a SHA-256: fa51e5a9eb9aab77d8cfc5fe151992d31924b2c9e088badd250eb4631f3df2df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a mass external PDF link farm. The document contains numerous embedded URLs, suggesting an attempt to redirect users to malicious sites for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and the presence of many external links indicate a likely intent to exploit users through web redirection, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • 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://ponafet.ru/wix?keyword=arkansas+county+guide+service+reviews
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/93d59c50.pdf
    • https://cdn.sqhk.co/fagaxirupunu/gfiijiL/download_hp_print_service_plugin_for_android.pdf
    • https://cdn.sqhk.co/wanadujogo/VW7iaoN/old_phone_keyboard_layout.pdf
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/fomaz.pdf
    • https://cdn.sqhk.co/xanapaje/gYia6gd/bundle_of_joy_song.pdf
    • https://cdn.sqhk.co/kedezoge/BjaqIii/70641575356.pdf
    • http://kudusakepupa.sportsontheweb.net/ashokan_farewell_score.pdf
    • http://gewusoluxul.scienceontheweb.net/viziropima.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lawakux/zezinexasanexefazif.pdf
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_2c20463d86ea4ec09def7b53df1f256f.pdf?index=true
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_5d28ab4e57b74a36b3c62fa827a68965.pdf?index=true
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_800c7dc820254a6299d38b8088475906.pdf?index=true
    • https://s3.amazonaws.com/robumuduluwise/2831603136.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_bac8761adc2e417ab15aff80ff4ebc9d.pdf?index=true
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_6ec9d587d7ec490fa16672cb021dc9f0.pdf?index=true
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_55f32476fd164a94b006d071573af379.pdf?index=true
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_771bca63710741deac63da0694b17ffd.pdf?index=true
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_dc2d6daafb4c4007895d48833f6d237e.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_off0000e7ed.bin
6b403761fa95f5ed4f7ad27de4e9140002d12eb4f35e52b71fec1ef69f4c286c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 5384 bytes
font_01_sfnt_off0000fa6a.bin
16978a0b853c235a4cc04717af21c077a2980db293cca2b2c7c039a9e1eb2761		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 11356 bytes

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