Malicious PDF — malware analysis report

Static analysis result for SHA-256 08148bf621866e24…

MALICIOUS

PDF

92.0 KB Created: 2021-03-09 04:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d6348979b62f2daa8fbb69a641682efe SHA-1: 2a1c6cde0418cc92b9e167e93be47234ce9cb3c2 SHA-256: 08148bf621866e2489bb693c5b219ad7fc8f400f7d5f422cf775c3cc6de602e3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://ponafet.ru/123?utm_term=basics+of+computer+science+engineering+pdf PDF link annotation
    • http://piruzinomezobif.22web.org/define_emergency_action_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_600a15a4ec89e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6021a87f235ca.pdfIn PDF document text
    • http://lofomerevudawem.iblogger.org/29041853917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_6044747f36ef0.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/d527a02eebac2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408478/normal_5feed27327041.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/rewapugufulebagusuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_602ca3ede1b37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_6003d78616659.pdfIn PDF document text
    • https://suretilan.weebly.com/uploads/1/3/0/7/130738944/c30dcc97389415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_602fcf39be02c.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/47b8c123-d4a4-46b8-b863-9c3a777cf8b8/13763091891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d5863e-fe7f-4c8c-90c9-8ff8c5cd6a1c/bivaxexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e18ba3-f8ed-49fb-8baf-ddf664f39216/multiplication_table_30_to_100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005fda67-4e09-4e8c-9330-f3aeb735493d/basic_guitar_chords_finger_placement.pdfIn PDF document text
    • http://jasetaroxakil.rf.gd/suvamusoludopojogirebasak.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_6b1aaac4dc8143a6aed034f2186e7344.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_caa16e622e6e4234ac0afd96d6044940.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_3b9363ea93004429b7d6962f12eee775.pdf?index=trueIn 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_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 5492 bytes
SHA-256: 490a8c1d2155bc648d7276ea04c460f17a0f7654f16ad65ed53ca0bbf54806d6
font_01_sfnt_off00013da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA9 10788 bytes
SHA-256: 63f9bab87bcada2ced14812e0a11318cbc8552b68421f5869e65aca0877bef4b

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