Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e164141647e3bab…

MALICIOUS

PDF

71.9 KB Created: 2021-05-07 11:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3745a5d1e72d7d04334b9c8394456712 SHA-1: 7c92df35231df185c8d12e660d1e9860977a7542 SHA-256: 1e164141647e3baba9e602f85dc60146ece3dfeb44e7e18b8ae40e61d608ca39
156 Risk Score

Malware Insights

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

The PDF contains a link farm and a suspicious URL, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=paper+bag+princess+costume+for+sale
    • https://cdn-cms.f-static.net/uploads/4497685/normal_60610d0483bc0.pdf
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/lobefijiwevime-suposatofazuwu-fogewemiged.pdf
    • https://julogunakununu.weebly.com/uploads/1/3/2/8/132814048/pulagikakamil.pdf
    • https://static.s123-cdn-static.com/uploads/4496592/normal_5fc78c5ed9c15.pdf
    • https://vefubonipit.weebly.com/uploads/1/3/4/7/134719522/cf0283543f35.pdf
    • https://cdn-cms.f-static.net/uploads/4384644/normal_60366a70b658b.pdf
    • https://tuminiride.weebly.com/uploads/1/3/1/6/131637714/bipobetemopat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_ae77f053f5b04043ab08b86f08436d83.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ece7c7c7-83a9-472a-bda0-5348d8eadaca/namemuzugepesete.pdf
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_35869a5f3ef340b8b25eea2774545144.pdf?index=true
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_9d4eac053da64661b2e344b6da6f3a67.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_563620ee6ce64b158766ee9744153f5f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9254023-c8ae-43e6-a2b7-484081b43c8d/code_name_verity_age_rating.pdf
    • https://uploads.strikinglycdn.com/files/6b9747d2-00ad-4f79-ba61-a9d3978cad9f/1126101611.pdf
    • https://uploads.strikinglycdn.com/files/d6aa1b2f-6278-4a52-a486-314c1663ad27/audio_technica_lp120xusb-bk.pdf
    • https://uploads.strikinglycdn.com/files/22aeb5aa-11fa-4961-b85c-1cab7dba20c2/augustines_confessions_book_8.pdf
    • https://uploads.strikinglycdn.com/files/8dec0c0d-a729-4988-8a89-995443af2d53/diablo_3_ps3_save_data_download.pdf
    • https://uploads.strikinglycdn.com/files/178702f3-c676-43b2-9073-812735fab3c1/how_to_apply_for_obamacare_in_illinois.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_off0000db54.bin
0a66881265d518c691f9c3c485fafb5f5cbdcbdd36b74c67336cb6b8a94be196		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 5476 bytes
font_01_sfnt_off0000ede1.bin
1da5a6f81ef245c21d6f0631c8f094349cd2c274b1817e4519edfe0ea9207618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 10768 bytes

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