Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a74bf051e61d55…

MALICIOUS

PDF

89.7 KB Created: 2021-05-16 12:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 462329d373373a604cefbd57feacf677 SHA-1: dd188ab1b769484cdc68468d27c578a24236bc70 SHA-256: 08a74bf051e61d550e1a01e46b888d3d62c9e5508fc89f4e800ecbfc4de7fb86
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing and malware distribution. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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/strik?utm_term=edad+de+eva+luna+montaner+y+camilo+echeverry PDF link annotation
    • https://cdn.sqhk.co/vurifozi/aejitF6/best_camera_module_for_raspberry_pi.pdfIn PDF document text
    • http://opensalon.xyz/22943802717bnrrb.pdfIn PDF document text
    • https://piwifagipob.weebly.com/uploads/1/3/1/3/131379899/monoxi.pdfIn PDF document text
    • https://lebotuzipum.weebly.com/uploads/1/3/4/5/134519329/xavunexirama.pdfIn PDF document text
    • http://mikrotikwizard.com/73889686819pddd5.pdfIn PDF document text
    • https://xibareze.weebly.com/uploads/1/3/4/0/134040347/weluwizijezewidi.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/fd8bc8d3a.pdfIn PDF document text
    • http://newberginvestmentproperty.com/sandisk_clip_sport_plus_16gb_black_reviewwkjl6.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/pukerefusilu.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/vifZCih/zubasebodujozusifapekerar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fb3dd4-184d-458e-bb14-d8b37b149ad3/bematakage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c05cd46-94f8-43a0-b130-3a00e1ad44a3/56783291898.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/fedex_drop_off_new_london_wi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609b169f-5d03-4a02-9ab4-eb936c5b13a9/introduction_to_song_analysis_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95f265c-a3b8-44fa-99d3-0dbd02ea0cfb/97895879175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859231f9-bcb7-4bfb-906c-61ffb16c3827/12514341623.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/fundamentals_of_physics_11th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/beratowovugolojipevu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 5120 bytes
SHA-256: 8ac9a6c9073d16aaeff7f1c7c3ef0008a231e7ddec5ac64c5f836646e2b64c64
font_01_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 12676 bytes
SHA-256: 44b95afbd155304d3e2fedb4b76ca4219770a64f9919d5c55b0792dbef6c122d

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