Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f07346865c2b9f…

MALICIOUS

PDF

111.4 KB Created: 2021-02-25 10:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f77a384050716e7ae3f8007d4974e71d SHA-1: 05a9ad9871880552e0f522e896693b4daa5de089 SHA-256: 52f07346865c2b9fd14059a328def94912cd04f300500fde6ff3b9f69140d146
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing 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 malicious activity, likely related to driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=hegelian+dialectic+problem+reaction+solution PDF link annotation
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/juwavufeba.pdfIn PDF document text
    • https://webifapemow.weebly.com/uploads/1/3/4/8/134890902/juvobireje-rusajox-gugokoxekat.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/ahfjhjy/asylum_escape_room_chapter_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fe99a95e57c4.pdfIn PDF document text
    • https://cdn.sqhk.co/rowemarul/iiihjgd/musut.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/dMpjiic/2712725700.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/67335936535.pdfIn PDF document text
    • http://kunonelujaver.22web.org/online_converter_to_word_online_free.pdfIn PDF document text
    • http://xexogafuko.22web.org/20095852946.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/xVThjVN/xorukunakasoxopovonit.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/ichklW1/32006911693.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/lobibafawagamitunov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505159/normal_5ff077735ec21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_600d8c43ef943.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/beginner_weight_training_program_female_at_home.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bosurigazo.epizy.com/rexovuvozakigenogabeg.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/burnout_drift_seaport_max_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/south_africa_constitution.pdfIn PDF document text
    • http://sobajagas.rf.gd/defavesirutazevap.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/stanley_model_number_bc15bs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000175b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B5 5496 bytes
SHA-256: 778d107c333f2be3ce040d3e3cb5cb1d9422fb5e3bc28315dce03883a60a77f6
font_01_sfnt_off00018844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18844 11448 bytes
SHA-256: 450fdc7477754affba182feaebcbe7f797bfdf62750b4f22165cfdcf0282c585

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