Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b356b96db503527…

MALICIOUS

PDF

42.3 KB Created: 2020-11-04 01:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 194c19cc6f7fe64e430f30c00e0b3b52 SHA-1: dc0b378c6a5de9bc805d4c768de9b0ade7622035 SHA-256: 7b356b96db5035277fd9ed583c64baf197024686260548238e818c4e3022704c
204 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?keyword=redwood+elementary+utah In PDF document text
    • https://rilofope.weebly.com/uploads/1/3/4/6/134630674/2276338.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/702e1584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_5f96d06f6c2a6.pdfIn PDF document text
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/lasokiwovamu.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/876c5956c859bc8.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/kowevudakorigerisew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5fa1dd6f7b9e5.pdfIn PDF document text
    • https://zajefepitav.weebly.com/uploads/1/3/4/2/134266194/6927148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tadovu/carter_yf_carburetor_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/868674524.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/musisagixu.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C69 4924 bytes
SHA-256: 810b31806d59f790842cb5d173cc976ba1f63c8d6f7e9c55d6d5a6adc991851b
font_01_sfnt_off00005d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D05 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00006867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6867 10956 bytes
SHA-256: a0c7735104b145e3c13d04ca479d026cf823d5acf593f65f3e1dde42dde4dd72
font_03_sfnt_off00008de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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