Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2046f36fcfa51b…

MALICIOUS

PDF

81.5 KB Created: 2021-03-11 22:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6e540276b44b7462201068ac8ea215eb SHA-1: a724b49f7cbd8fbc5ebd2dcce5bcc3a9bb4976f6 SHA-256: 8c2046f36fcfa51b4e96f86d9ffd331f4fc368eb414f39a982429584567563cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://golowaki.ru/strik?utm_term=what+kind+of+jobs+can+i+get+with+a+public+relations+degree PDF link annotation
    • http://vibolofisef.mywebcommunity.org/61675092114.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/66387832968.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/giwosija.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/95801201718.pdfIn PDF document text
    • https://cdn.sqhk.co/wumerelup/OP47gjN/10250888731.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/broad_opening_statement_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/hvSr1gg/duvezunogijukisifururov.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/djevijG/56394810548.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/what_is_cubic_spline_regression.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/mr_heater_big_maxx_80000_reviews.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/28790768657.pdfIn PDF document text
    • http://suzamakulamuj.mypressonline.com/log_bar_table_and_chairs.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/towud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wivaxodi.onlinewebshop.net/reznor_gas_heater_dealers_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/attendance_allowance_claim_form.pdfIn PDF document text
    • http://laxukumelukadut.myartsonline.com/23799558893.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/dbt_emotional_regulation_skills_list.pdfIn PDF document text
    • http://zonurupadul.atwebpages.com/waboraxujojalunivugewoson.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/juzarol.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/382708705.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 5684 bytes
SHA-256: e75e4b5f3c3c79f11b060e77497e38528248842c0468f40cc35db7e7ab157a92
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 10960 bytes
SHA-256: 3d1438e51fe946fa77631abbc8bb725f8ff3a5b76297dca5705163d3d457aaa5
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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