Malicious PDF — malware analysis report

Static analysis result for SHA-256 813951f0e7dcf1bc…

MALICIOUS

PDF

65.7 KB Created: 2020-12-28 09:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ac6243f5a83af96bf817e99f5a4cef2b SHA-1: bb558d10d1dc2da5afa863db639ffc1e4e127a85 SHA-256: 813951f0e7dcf1bc1b2ab14851118fd4c702beb86f16d0caa40efa19e5011bc3
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and are part of a link farm. One critical heuristic identified a link to a known malicious redirector, and ClamAV detected the file as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious links as job opportunities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://traffine.ru/aws?utm_term=performing+art+jobs+brisbane In PDF document text
    • https://watubozez.weebly.com/uploads/1/3/5/3/135346011/kiwob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_5fd123f58e770.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/fegijal_xubotogugok_gofakelewotoget_mirimivaki.pdfIn PDF document text
    • https://senovetesu.weebly.com/uploads/1/3/4/7/134710525/5423947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f876dff4c9f3.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/9402786.pdfIn PDF document text
    • https://nexuroge.weebly.com/uploads/1/3/4/4/134465667/tagapudanamofi.pdfIn PDF document text
    • https://fejagirizow.weebly.com/uploads/1/3/4/5/134525681/bokasekisut.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/944c33250db.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/93781635-36db-47d9-b528-1cb06bcc52b9/lukojimutetowubopuduti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d95f3f8-3aa1-4a0b-9e48-3df798e359f7/landforms_word_whizzle_answers_level_712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c06f266-c50a-45f0-bd0e-75732b3d95c2/nys_regents_chemistry_curriculum_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a485d0f-87b4-4a28-9f2e-4b94de216a42/contour_next_one_user_guide.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_off0000c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC488 5272 bytes
SHA-256: 93e38a3518d0062f6df745ad7f9488c6da10e1b73b2f54cf97117bbddf0c8e21
font_01_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 10564 bytes
SHA-256: 58deb7947632cda99e7495c42f26ddae9bb41db267f98ba41c92dd946c4006d1

Open this report in the interactive analyzer, or submit your own file for analysis.