Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4f3071703d3c40…

MALICIOUS

PDF

70.4 KB Created: 2021-01-21 12:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 431ca9cb642f2d4f08903dcee3e47897 SHA-1: 9280684b08b637b99f7245de89247f7f2c360986 SHA-256: 8e4f3071703d3c40c0fdc17a25f48c682e4d909cd5bab83f6524b05fd6c5c365
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 embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=abs+diet+workout+plan+pdf PDF link annotation
    • http://jelesanu.iblogger.org/gokisefosibebomix.pdfIn PDF document text
    • https://xiramulume.weebly.com/uploads/1/3/2/6/132682542/nigopisaguro_felazemupiju_zesewetu_nodusopo.pdfIn PDF document text
    • https://lurusavi.weebly.com/uploads/1/3/2/7/132710630/bezawojupi.pdfIn PDF document text
    • https://wiwamimojuwat.weebly.com/uploads/1/3/0/8/130813692/takokakakulam_pexulode_vubobuzosunax_migola.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/ggNjdhj/cheap_international_calls_from_ireland_landline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_6001e45d32aca.pdfIn PDF document text
    • http://xinupavob.iblogger.org/declarative_and_interrogative_sentences_worksheets_free.pdfIn PDF document text
    • http://zakukat.iblogger.org/guide_auto_entrepreneur_2019_urssaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5fb2d008a8780.pdfIn PDF document text
    • https://cdn.sqhk.co/wepenujofow/txiiyib/11896570339.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/firaleragenax.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/wexukufedepim/sapeme.pdfIn PDF document text
    • http://ginojakoli.rf.gd/mcsa_exam_questions_and_answers.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/are_ip_addresses_personal_information_australia.pdfIn PDF document text
    • http://xofawuriduk.epizy.com/julewikomobejatepenozat.pdfIn PDF document text
    • http://dizibabazuvuxu.rf.gd/84117135867.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/nostalgia_yanni_piano_sheet.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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 5320 bytes
SHA-256: 3139c2513cc15b706e244433e8f280972b46ff1a4796c31051dd786dab25a020
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 10576 bytes
SHA-256: 21f45013b60e188043c0e71f9bca43a58cb3dee5a05d6ede92572e1e733b5a26

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