Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b1e9e07e488f19…

MALICIOUS

PDF

78.3 KB Created: 2021-02-19 01:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 94fea348a567d5ddc01ee9c54116ac2a SHA-1: 93eabb7ec358dfade1ddcee516f0ec97bbf1ef6e SHA-256: f8b1e9e07e488f192848ba42d51be4daf37747ca673875c7ce3bf3caad3ec3b6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful sites.

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
  • 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://druttle.ru/wix?keyword=beautyrest+silver+quilted+memory+foam+mattress+pad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458854/normal_602dd717d3370.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/jAudYpT/tafolejomijepo.pdfIn PDF document text
    • https://linezajokopu.weebly.com/uploads/1/3/4/6/134629872/retonozox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_6010cb3c3a2a2.pdfIn PDF document text
    • https://cdn.sqhk.co/xokunafuse/xsje4kj/19347029459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482870/normal_5fe4c7c2ccfd6.pdfIn PDF document text
    • https://zeruxitewisav.weebly.com/uploads/1/3/1/8/131856065/ef8b33b.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/ijhfjix/wozawawetetakifesetoti.pdfIn PDF document text
    • http://birjand.design/86612706712igam8.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/rimexek-jezot-xomudibo.pdfIn PDF document text
    • https://kapiluruge.weebly.com/uploads/1/3/4/6/134672566/2585941.pdfIn PDF document text
    • https://bivejeweki.weebly.com/uploads/1/3/4/3/134322338/xitopukurawefijaj.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
    • http://musovulazapa.epizy.com/seating_arrangement_with_blood_relation_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/1752552171.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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 5300 bytes
SHA-256: 803f80b5c0754676eaa23c03a390598cf2331ce4a7a2fcaf64c9e72474a2fd33
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10384 bytes
SHA-256: 315e962d58dafa7eaa79df7f20fcf9467b826dfd3c9bcf700380428492325156
font_02_sfnt_off00011d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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