Malicious PDF — malware analysis report

Static analysis result for SHA-256 8279136b18a878f6…

MALICIOUS

PDF

50.3 KB Created: 2020-11-06 05:34:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 878341ecee08a60cdf05d9fac6457d38 SHA-1: 2698d6823cf6da16b75f33ce091884439f71c3c0 SHA-256: 8279136b18a878f61a9abb6468b15829eede566e286d042685900bdcb5d7341c
146 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 an ML classifier. It uses a callback-phone (TOAD) lure. 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 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?keyword=youth+protection+training+quiz+answers PDF link annotation
    • https://zixamagexiwu.weebly.com/uploads/1/3/4/0/134012381/jagukejikopilup.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/xizisamej_lusuzupe_tuzid_tejuzosobu.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/bawap.pdfIn PDF document text
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/jisodu.pdfIn PDF document text
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/448623.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/vafutazinuzumewiwaro.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/b1ca0abb-1bd6-4f5d-91b6-629d4da47923/barron_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/5232993928.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/13437538294.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/gowofilokopikevumetadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc75a8bc-d25d-4e9e-a9fa-c931e9bc545b/30921044308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13cab67-00dd-4599-807a-cb86bad730ce/ramoziwolope.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7D 7484 bytes
SHA-256: 53d12bd848e92c55ca85a1f46bfdf58ce052d386f67780958af047ca36ccaa97
font_01_sfnt_off00008397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8397 5392 bytes
SHA-256: ba4df7e747176f0f3cd7ac6ac69140469c26a2315716fcfe53398f606acd56e8
font_02_sfnt_off00009604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9604 11128 bytes
SHA-256: cbedba2215a03fac242882841f3276ec29bf58438614b63b924e135e2707b6d7

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