Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc9932793b83ea3…

MALICIOUS

PDF

71.9 KB Created: 2021-04-01 11:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7685925f8533ae984985221bf39c4b6f SHA-1: c3452085cd868cfda949412d5ad97d62d9a24aaa SHA-256: abc9932793b83ea39aeac28634e8262096644815460a0fee0b315bec1b60bbc4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://dafemum.ru/123?utm_term=glynn+johnson+hardware+templates PDF link annotation
    • https://cdn.sqhk.co/tuzijaxab/79iaSgd/gikovozepojezovokisaz.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/390543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5feff5946fc63.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/Xx8s1ig/64480590744.pdfIn PDF document text
    • https://pifabevab.weebly.com/uploads/1/3/4/7/134721676/3365287.pdfIn PDF document text
    • https://cdn.sqhk.co/gemesikexo/aXjilxK/78616030360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_605c867729638.pdfIn PDF document text
    • https://roguvajodanuk.weebly.com/uploads/1/3/1/3/131379692/1232511.pdfIn PDF document text
    • https://minoximamus.weebly.com/uploads/1/3/1/4/131437876/dibepuvasego_sikigivunu_bepuvaloreleze_vetexopid.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/af4e6e.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/g5hjgdN/kokojusaxolalimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_5fd1e198d9431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/37761fcf-c1cb-4241-bffa-db587e78aac0/jesusodidoruxesofowitoxed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0384aaa7-9f0a-4aee-9075-7d2334caa458/39752350434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e05628a-f09c-4d4c-a06e-aed7b96ddbae/what_books_do_the_witcher_games_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5b4206-0c7c-4aa6-b6d8-74818a92c448/andrew_wommack_healing_is_here_2020.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_439819ab26924739b2ea582c87cd7204.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_945cf60c8eee4f1c8b0628eda9c2723e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8249930d-9567-4725-9f4a-8a44797cea07/41299229368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf9f53d-524d-4456-9f13-85c7c759d36c/449844136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa75bf9-5062-41c7-a02d-a9b951967980/piboman.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 5240 bytes
SHA-256: f7019f7097973a3fc5ec0bc5d9bdff3d50bf724d8f0e8664d6456ce9bad5f520
font_01_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 10248 bytes
SHA-256: 7a3aaf6bf39adb1936720cf90e189fac7ac5597a1665352b7a20fa05ca1788e8
font_02_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2