Malicious PDF — malware analysis report

Static analysis result for SHA-256 caca8fbaa35e452e…

MALICIOUS

PDF

78.6 KB Created: 2021-03-11 10:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9457cd7f5c9192be24f601fd4c3fd2e SHA-1: d01a88b25b36e5dce03362cd2fb3a1cf3f553a6a SHA-256: caca8fbaa35e452e590bb801a12fb38c5ad102f38c13cd3ff6a59f7b7d5617ab
246 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting services. Heuristics indicate a brand-impersonation credential phishing lure, specifically impersonating Microsoft. The document body is heavily obfuscated, but the presence of numerous external links and the phishing heuristic strongly suggest an attempt to redirect users to malicious sites for credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/1208805.pdf.
  • 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://dugedepap.ru/123?utm_term=blood+money+movie+songs++pagalworld.+com PDF link annotation
    • https://cdn.sqhk.co/bilexodofose/j2jbPgc/roller_coaster_rush_adventures.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/1208805.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/91f31c770e9d1.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/e3hj885/gallery_wall_frames_target.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fd67dd1bde45.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/wobugikef.pdfIn PDF document text
    • https://dozadekexojigig.weebly.com/uploads/1/3/4/0/134096874/kiboduwata.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/7d604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462059/normal_5fed604322243.pdfIn PDF document text
    • https://xegezutiraviral.weebly.com/uploads/1/3/0/7/130775125/f6d9712b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_60485b859ad65.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/bonaraduxepobuxatom.pdfIn PDF document text
    • https://vimavaduziwali.weebly.com/uploads/1/3/1/8/131856569/63aadbfd8fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_604219e5cde91.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/desuzokavabadut.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/zgiNnHQ/benudowinevevot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvetaso/hey_soul_sister_song_musicpleer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd4484d-f07b-4285-8988-4391f23aee75/6056189173.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/mafazajeza.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/yin_r._k._2017._case_study_research_and_applications_design_and_methods._thousand_oaks_ca_sage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d05563c-2af2-4a00-a990-533b31651b02/94431826858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf4f41b-5def-43d8-ba1f-2ed4d1e2afef/luzapade.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_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 5728 bytes
SHA-256: b6eaa0f9c1b2eebbff1e281054637b65afef527fa5d1ecabbc39c5f72a2ddc68
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 11444 bytes
SHA-256: 237f5301f55b985cc599b5b3743ebae99a6795a2555ea9fdf0cdafc20f3dd65c

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