Malicious PDF — malware analysis report

Static analysis result for SHA-256 96fb8b8b6b86f488…

MALICIOUS

PDF

73.6 KB Created: 2021-06-03 02:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e177007936aece59af314f1dc2756d22 SHA-1: b265eb7aac33b8729a59e11c69af88273dfa6eda SHA-256: 96fb8b8b6b86f48823dfe50f94f59dd8a59141d18500e824bfba71171346d96c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://crewmak.ru/pbw?utm_term=what+are+the+deviation+of+beer+lambert+law PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489251/normal_600b12a06d8e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_60367c446aedb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5fe98ded70582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_605211727f2ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_6050fcd4967b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_60217ca5a1425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428062/normal_5fc73c89e1725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_60637e726ba60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_603e4bb602e86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_6008748fde188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_602fd16387b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_6034c92e2f26b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_6023d93800604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420765/normal_6005740b445fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144464373/how_to_hook_up_cable_box_from_spectrum.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/sanedudavopomugiweruwoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf0d93b-36ac-499e-8d81-53fc224ac335/simple_past_tense_regular_and_irregular_verbs_list.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/9961941725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622b15cc-aaae-4369-9529-ca3299f12edc/getufijuf.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/reset_hikvision_ip_camera_to_factory_settings.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/zebepifosumaxoluv.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_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 5276 bytes
SHA-256: 6259c2c609f70d79945ee2923ee129c7c3e477d9e55f963c4a57625f358839ea
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 10756 bytes
SHA-256: 4bb10d309140f4e6db93135541c27eddc29989711c5809a258bf3b03367d086c

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