Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e38aa63c296c25f…

MALICIOUS

PDF

75.6 KB Created: 2021-06-02 10:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f02b942ab7bf7012155c5b6ef59aec78 SHA-1: 632536fbacab4bfeaa6c80946063929df9ab6290 SHA-256: 1e38aa63c296c25f6aa439703bd809d9cf37fa2b9be125e89d1129cadc3fcd65
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/pbw?utm_term=charities+commission+annual+report+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449397/normal_604ed9f11b7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_6061cb411d13c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5fef898491fba.pdfIn PDF document text
    • https://monivewuvafa.weebly.com/uploads/1/3/4/0/134096064/ccbbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_600ee8ef0356b.pdfIn PDF document text
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/60958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369323/normal_5fe256bf4d5d1.pdfIn PDF document text
    • https://jivefumo.weebly.com/uploads/1/3/0/7/130776755/4595721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_60127fdb54706.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/wanitas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_604505bdeb970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470833/normal_5ff84742e5ffc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5ff163da5f237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_605a9b39c1a61.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/558b068f-2c3b-43b3-ad5f-ba3315a679aa/actiontec_gt784wn_specifications.pdfIn PDF document text
    • http://magogopowo.pbworks.com/f/jumpmaster_study_guide_fort_bragg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33a9910-d54d-47ab-887b-650c505a374f/himiko_toga_turns_good.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144419616/21294455551.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426765/world_coin_price_guide.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144427104/planet_earth_caves_47_minutes_2007_worksheet_answers_key.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/f/45924574150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b53466-ff4a-4028-b649-eec596967a92/types_of_valves_used_in_hvac_systems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c6879a-72db-4873-9d05-c6ff4da4b92f/44059421318.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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5076 bytes
SHA-256: c1d928830f1b0132816b74c94d3dd68b40d331a0b650783216c052b4e0066e10
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 10552 bytes
SHA-256: bcf171207a6e8fed67b0a006d1bbc86ea54ed1840fb970492a2747fcf2195997