Malicious PDF — malware analysis report

Static analysis result for SHA-256 979db9f85a43f47e…

MALICIOUS

PDF

73.2 KB Created: 2021-03-23 04:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c0a5b7e6ddb1f9cdcdea32385b2825a2 SHA-1: 21c427753419fd22a7ac21ad5e8a9c1dec6a7bc8 SHA-256: 979db9f85a43f47e1eea9a93cff69c69274a6590bb897cb29b6ad4244158a4dd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains references to 'Academic report writing definition' and 'wkhtmltopdf', likely a lure to disguise the malicious intent.

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://botokaw.ru/123?utm_term=academic+report+writing+definition PDF link annotation
    • http://kazexajisodibu.medianewsonline.com/mudoj.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/diary_of_a_wimpy_kid_old_school_full_book_free.pdfIn PDF document text
    • http://roselosudeve.sportsontheweb.net/rules_by_cynthia_lord.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/xajejezarakopejedugol.pdfIn PDF document text
    • http://dopogabijup.mywebcommunity.org/how_do_i_setup_my_honeywell_thermostat_app.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/54992966897.pdfIn PDF document text
    • http://wotegop.22web.org/fluval_206_filter_troubleshooting.pdfIn PDF document text
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/fizazikexakago.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/comala_workflow_report.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/bio_zoology_12th_practical.pdfIn PDF document text
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/9565010.pdfIn PDF document text
    • https://fodigedij.weebly.com/uploads/1/3/2/7/132740281/1bdec86eef25.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/darisowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_9f5b52deccc94807b1c17304d1423ebb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/jopoxagumapud.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/below_deck_med_episode_guide.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_961dae41feec40b68f67a4649b3ef16a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/51024848142.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/95221628276.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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5344 bytes
SHA-256: a7efd66f12608518c7688f6df998266ce23192e76172b63275786ae7e7c5054e
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 9540 bytes
SHA-256: 94dab3b61ea33bcdb0cc7902a4ce19f4e296ab19b625a5cdb9d6205487c8de08

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