Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5e6bf970ae986c…

MALICIOUS

PDF

74.2 KB Created: 2021-02-28 05:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b12924d5995e99fe43e8c7eaf6463eb6 SHA-1: 97d992c3318bf5e6969720ef2514dfa74101daea SHA-256: 8b5e6bf970ae986ca1ede3b65b8c2d9a9bc87d6867e8ce60de0490f7754fe665
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://jumiwimov.ru/strik?utm_term=communication+principles+for+a+lifetime+6th+edition PDF link annotation
    • http://gejudoxe.mypressonline.com/how_to_reset_boat_bluetooth_headphones.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/cWKbjgg/narcos_cartel_wars_hack_tool_download.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/planet_fitness_pf_black_card_worth_it.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/ij0Zi2c/6511479336.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/F2ighfb/hearts_of_iron_4_parent_review.pdfIn PDF document text
    • https://tudodamoziw.weebly.com/uploads/1/3/1/8/131872054/mexanudile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366029/normal_5ff27d0d761ca.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/WigjbmV/vector_addition_formula_resultant.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490752/normal_5fc881a625be7.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/jafnQ85/forasefotuzimenodap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484359/normal_5fc5cdf196f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_6029f84bd9387.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/hcTDigu/rilodesej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_602a1e761fdab.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/9454935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xologikaju.atwebpages.com/nitisovupuzoli.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/zulagidelupebava.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/17448373780.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_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 5456 bytes
SHA-256: 2edf1c558af020c9e239034b9b843a64300f5c853dcfa3fbfc4f3b6852cea065
font_01_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 11036 bytes
SHA-256: 767e1337ac995b42d986efc0c8683424e4d5cf48b87db324adbe77a76990db51

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