Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abd8dcf816fe2c0…

MALICIOUS

PDF

65.0 KB Created: 2020-12-16 01:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7d4ec161c9446362cf0367f3937eca42 SHA-1: d77f254e5e0f5eccbf242957d5140b1875c7d870 SHA-256: 1abd8dcf816fe2c041cbeb83c358f94568dedc55d6d1a8bafa28ce908a55e2da
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-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://trafffe.ru/strik?utm_term=arris+surfboard+sb6121 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5fd8bbc29a4dd.pdfIn PDF document text
    • https://jabizujosewej.weebly.com/uploads/1/3/4/5/134584717/3064511.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/478092.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/tenuwonirizumuwetiz.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/da337fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_5fd376965d504.pdfIn PDF document text
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/eb3caed5481ae.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/bafcda26-aada-4bdc-bb5c-9df1a25c4746/schema_electrique_centrale_clignotant_tracteur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66dc1ab-8ae6-452d-ac45-8b0caf62029c/marvelous_misadventures_of_flapjack_cat.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/linlithgow_weather_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/92891334990.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/thesis_statement_examples_for_opinion_essays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a481375-ed1f-4ab4-b2f6-0264b6d8c7dc/critical_ops_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8598bc0-a644-4cd8-9d40-fb1e7d09496e/zitibabemebamenaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954d33a2-119f-4449-8c3d-d47208da93b2/codigo_penal_puerto_rico.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_off0000c1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EC 5336 bytes
SHA-256: 77ce04ebae8316edbd763106f212c9b6a6af2a0773306f77fc906d0a9db307a1
font_01_sfnt_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 10332 bytes
SHA-256: ce5b4ecfe73dbba4fc8880adadb00d4d16801504f7c3ce12b5e502ec0f1ecaea

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