Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc05693c16f91ac…

MALICIOUS

PDF

75.4 KB Created: 2021-02-22 22:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 71ba066fd2c413b4059d2c2b7b489644 SHA-1: cc486942fba6aed108d4def0845008b8091c5bb6 SHA-256: 6cc05693c16f91ac8e28a85535a841f8d6e48aba1b7cf7c5c317f8d943f3f173
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable domains, characteristic of an SEO link farm designed to drive traffic to malicious sites. The embedded URL 'https://baarspo.ru/123?utm_term=stephen+hawking+wife+and+kids' suggests a lure related to search terms, likely to redirect users to a phishing page or download further malware.

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://baarspo.ru/123?utm_term=stephen+hawking+wife+and+kids PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383300/normal_600847826359c.pdfIn PDF document text
    • http://8bitbeardsco.com/55864963622vot09.pdfIn PDF document text
    • https://bixarina.weebly.com/uploads/1/3/1/0/131069915/2d995e45b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_60319977331e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_60151040002e1.pdfIn PDF document text
    • https://gafeziluwer.weebly.com/uploads/1/3/4/3/134310472/edc66.pdfIn PDF document text
    • https://kogijusixi.weebly.com/uploads/1/3/5/3/135312463/moxebumewubotudutel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fe7900ae4adf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_6000118246008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5fd986250b577.pdfIn PDF document text
    • http://detonic-official.website/ap_intermediate_textbooks_english_medium_20195zek7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_60257b4501901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_5fdbd2e25d0ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_60053f626c9b9.pdfIn PDF document text
    • https://lesinagin.weebly.com/uploads/1/3/1/4/131454304/f155a6d1af3f2a.pdfIn PDF document text
    • http://youtube-subscribes.com/birutovaruwimo16p1m.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/bokexizometun/how_to_use_3_cup_aroma_rice_cooker.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_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 5432 bytes
SHA-256: 3443fdfa7f52a85732afcd92f1341db928f7620a0b4b3082a7b2a046758349d7
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10124 bytes
SHA-256: c920d765fd5f74e7b2b105e7af9f3797f7a3d77940c129f86b01d9f2624b69d7

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