Malicious PDF — malware analysis report

Static analysis result for SHA-256 864a6c3e58efb38e…

MALICIOUS

PDF

78.6 KB Created: 2021-01-06 09:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f353c3a60a95990cce62c306ac3d9980 SHA-1: db2b13fefa431d3f04e3ff4372936c24738438d7 SHA-256: 864a6c3e58efb38e43a2aac2eef549649ccbe302d7a38a7b345dd80fbf33d282
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 hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=wasteland+2+guide+creation PDF link annotation
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/6182291.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/5qvig8b/mx_player_app_for_firestick.pdfIn PDF document text
    • https://niridugur.weebly.com/uploads/1/3/5/2/135296669/xefesonomereva_voxedolijudu_tiximuli.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/sarupawelevifosedax.pdfIn PDF document text
    • https://mubisajapesufu.weebly.com/uploads/1/3/4/6/134620746/mefewike.pdfIn PDF document text
    • https://wulejowaru.weebly.com/uploads/1/3/4/8/134886315/kagenu_vusowa_punoli_rolodo.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/YG0jcif/holy_roman_empire_historical_definition.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/e7ab6e2e6a0398f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fc67aee0b855.pdfIn PDF document text
    • https://gojodisob.weebly.com/uploads/1/3/4/6/134664442/jirenek-nizegesuzar-juxazakuwe.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/wubarenikalovuveg.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/igP4Ggd/cowboy_rams_game_score.pdfIn PDF document text
    • https://ranedesipa.weebly.com/uploads/1/3/1/3/131398497/4080363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 5252 bytes
SHA-256: 5cb4de1b809a4b4a1d3fb37396c8f445e669d0c36313af5c95a8f3944f5f9477
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 10812 bytes
SHA-256: 3fa46819f7f2491a95c51d565e9d8187a884de4e26fbe7af2bb2bb7a92934794

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