Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e3545e11437933…

MALICIOUS

PDF

75.4 KB Created: 2021-06-07 09:39:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0715e2ab48faa6ab6b5f17355086c209 SHA-1: e368e5369fa4e1d64adc1dd546e8f78d6784f7e3 SHA-256: b4e3545e11437933e1c7c00d05c38f6750b23544d32d0b56829792641ed87a85
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL 'https://crysiq.ru/pbw?utm_term=wwe+2k14+apk+data+free+download+for+android' is presented as a lure for game data, further supporting a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=wwe+2k14+apk+data+free+download+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380214/normal_60515996b46cd.pdfIn PDF document text
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/4221102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_602a7494b8e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_601fd18b5d7ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_603683b1befd1.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/488056.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/retune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_600d17d341703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_604654495d6e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_6046643d046b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_606d3969e671f.pdfIn PDF document text
    • https://ravawulivu.weebly.com/uploads/1/3/2/6/132682570/wurimuzeluwono.pdfIn PDF document text
    • https://xukoperupe.weebly.com/uploads/1/3/4/7/134743664/vadexoxexuxajux.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/959a63e7-f30c-46ff-8b59-603d816099c5/rucoy_online_beginners_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9c9ba9-171f-45f9-bfe5-64854ae42cbd/24467721956.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/f/fofubuvotu.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144778614/what_does_tomorrow_and_tomorrow_and_tomorrow_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fcaac60-f7fd-43c4-8db5-78d644984f66/76577092737.pdfIn PDF document text
    • http://xibosini.pbworks.com/w/file/fetch/144498189/98135997062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af937adc-61d6-45ce-8ead-e23efde88eac/how_to_calculate_the_theoretical_yield_of_mgo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55d52b7-9552-46a3-839a-1d17df6a1bac/how_to_tune_a_cobra_29_ltd_classic.pdfIn PDF document text
    • http://ritijix.pbworks.com/w/file/fetch/144510792/101_contradictions_in_the_quran.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144488028/jugawiruzol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237309ed-93f7-43fe-885e-c4b71e8f4565/68185702262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f0c35e-a770-416d-8f05-d70da49bb389/sokujubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/736d688a-041a-4ada-bf55-e892c3e50051/porsche_owners_club_grill_badge.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_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 5296 bytes
SHA-256: 3c285b5826e0917b8fbf21c78c8f7df33c4768ea4c376e7942060c5f56dfda85
font_01_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 10592 bytes
SHA-256: b54173585665ae8c57f093eb21923ba7f36249834e4e942219bf69b28d8f0ea7