Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab486808a160d2a1…

MALICIOUS

PDF

73.0 KB Created: 2021-04-04 04:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e75756146891083b2e622038390cade9 SHA-1: 5b1884b88c418c52b6609610b8e75ffe5e8a2e1e SHA-256: ab486808a160d2a1c9f4afc90474f0b0f17163c7429dd67b0658ef39b7a6972c
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://gimoguvi.ru/award?keyword=descending+tracts+of+spinal+cord+pdf PDF link annotation
    • https://cdn.sqhk.co/tesikotuk/eNW6geQ/good_humor_ice_cream_sandwich_nutrition_information.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/jaTpuhc/ixl_learning_careers.pdfIn PDF document text
    • https://cdn.sqhk.co/zokonerozo/lJTM9oS/food_poisoning_guidelines.pdfIn PDF document text
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/8097347.pdfIn PDF document text
    • http://levitajagukog.scienceontheweb.net/43354105487.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/eQUpMib/reaper_overwatch_costume.pdfIn PDF document text
    • https://gomisixazu.weebly.com/uploads/1/3/1/4/131437427/1832310.pdfIn PDF document text
    • https://cdn.sqhk.co/luzaxatelal/jgEhepS/10.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuzekovodi/8hrhbgj/zombie_harvest_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/ifKjcNO/fegemugebo.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/gobigub.pdfIn PDF document text
    • http://wolifote.getenjoyment.net/kezedemax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobofob.rf.gd/rokujadutuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d43d06-198e-49aa-9144-e6edaa444315/que_es_la_fecha_de_corte_de_mi_tarjeta_de_credito_en_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d55aae7-6b5a-4d10-b8a7-9a7686a163d5/the_cask_of_amontillado_analysis_questions_and_answers.pdfIn PDF document text
    • http://wuwomuwudawim.epizy.com/93652846451.pdfIn PDF document text
    • http://nibudikugi.epizy.com/givawiwunur.pdfIn PDF document text
    • http://sewasijibakel.epizy.com/canon_in_d_classical_guitar_tab.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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 5320 bytes
SHA-256: cfd855747da1291814e5dd22d8d54aaa820d959d7006848800a221311da1b7a3
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 10712 bytes
SHA-256: 3743509b627e68e811b31f1e0e90e748663d459df6bc1cafcc2c432211735095

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