Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77dddaca0b7b314…

MALICIOUS

PDF

92.5 KB Created: 2021-03-29 13:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0d54b66c6adefd4e6454547f93c50843 SHA-1: 15a566c961feb6bf033035d719709647eeb2a35c SHA-256: d77dddaca0b7b314bdb8ce4f163601200dce5fffb71fbaf073e4b9210de96cb0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=racing+unblocked+games PDF link annotation
    • https://sujabowumosof.weebly.com/uploads/1/3/1/3/131398195/sujunalilireled_varazafo_pesafekokurig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_605bc4b9ea556.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/lewixap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5ff62b6193f5a.pdfIn PDF document text
    • http://zusagukitu.mywebcommunity.org/kawenaviji.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/4025273.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/the_100_year_life_book_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478393/normal_5ff3235b2f86a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_604d21bd1ceb7.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/7b9cc652-d3fc-425e-a1fe-a1938809d72e/93008755138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be7f429-4b08-4d59-960d-46ab4906b64f/99129549843.pdfIn PDF document text
    • http://pasibujaz.epizy.com/smoothie_recipes_with_spinach_and_carrots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bec5ca-8bb1-4be1-a9a6-83248e09e7e3/madak.pdfIn PDF document text
    • http://batezitiguduf.rf.gd/antitubercular_activity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef006ac8-d39e-413b-b315-6055a9bb38aa/how_would_you_describe_autumn.pdfIn PDF document text
    • http://latarugumajovi.epizy.com/nazolizidakubuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a2ad3d-6853-43d7-bbf6-96dc3eb6f0e6/finib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3743bab-9754-476d-8f18-c8c7c2733cd4/38706712644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3322a160-4a2c-4c45-a1de-55d56884c2c7/who_killed_hae_min_lee_poll.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/zibojazawikomife.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_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 5372 bytes
SHA-256: 5ab67bdcaa0d98638077d01910d2972fb2504a88e42654d471dac2625bccb26f
font_01_sfnt_off00013f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F00 11256 bytes
SHA-256: 9fe3ece7d6686fa69f3f0bc4a2cdf5ae3cff379829ad62bc38acca920df5dc7b