Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98d4fad77438f34…

MALICIOUS

PDF

71.6 KB Created: 2021-03-23 23:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 53a60ed12cda3bc40aa85aad90fb5db8 SHA-1: c411d46895f4c6528d34ab9694a744a6f4b62a14 SHA-256: d98d4fad77438f3497cf31086b685fb8403b741941ea079aa36dc1aa84829ec8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Angela's ashes chapter 1 study guide answers', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://zajinet.ru/wix?keyword=angela%2527s+ashes+chapter+1+study+guide+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5febbf36e9f1e.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/memudonukunilazap.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/xobudiwasu.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/70852.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fde822711f14.pdfIn PDF document text
    • http://kutegexuwudaro.getenjoyment.net/67082323780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367937/normal_5fff4f4cf1e6b.pdfIn PDF document text
    • https://tizezesi.weebly.com/uploads/1/3/4/0/134041120/abbfcb9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_5fe27af739bc3.pdfIn PDF document text
    • http://potozafit.medianewsonline.com/cooling_tower_catalog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415537/normal_5fc98fa89a323.pdfIn PDF document text
    • https://pozebukewif.weebly.com/uploads/1/3/4/3/134330137/xijidotimapakasu.pdfIn PDF document text
    • http://lalikexitaxixix.getenjoyment.net/counter_offer_contract_law.pdfIn PDF document text
    • https://raxugujelagad.weebly.com/uploads/1/3/4/1/134108814/rimojukedow.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/nivobavolab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/79575139116.pdfIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/body_reset_diet_smoothie_recipes.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/alluvial_mining.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/carteles_informativos_para_que_sirven.pdfIn PDF document text
    • http://murapimopavopa.myartsonline.com/durefoma.pdfIn PDF document text
    • http://jotudokizer.onlinewebshop.net/lux_tx9600tsa_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/mutual_funds_for_dummies_review.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/25384020549.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/85427568159.pdfIn PDF document text
    • http://pigutun.myartsonline.com/why_do_i_have_blood_in_my_eyeball.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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 5604 bytes
SHA-256: 68703bbefcbdf56965b4b3a494ce770b4e1a5bbd69ef3a6be6a770c5c219d7bc
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 10280 bytes
SHA-256: 3c3e7e3f3b24c150374b933fe5035eb3638c3c5a014dc2a57d06833443ab7bae

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