Malicious PDF — malware analysis report

Static analysis result for SHA-256 a897d6c928ff4a1f…

MALICIOUS

PDF

79.5 KB Created: 2021-04-02 05:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3505c56952cd1e43cb4dd31ea97bcccd SHA-1: 7b57c5dc96f598e773ef11576f5ce9738bcc19e8 SHA-256: a897d6c928ff4a1f0bcddeb68173d9d5e6af97b1601b16209b9e75f4a19701c6
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of SEO-optimized URLs like 'how to adjust salt in water softener' indicates a social engineering tactic to attract unsuspecting users.

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://vilenefex.ru/strik?utm_term=how+to+adjust+salt+in+water+softener
    • http://riniwodifole.medianewsonline.com/sorting_array_in_c.pdf
    • http://redatimiwanal.iblogger.org/58656641617.pdf
    • http://pabakijizozid.iblogger.org/motuworixufo.pdf
    • http://bumasujofoj.getenjoyment.net/sugewiguzofuseriviwo.pdf
    • http://jusukigib.sportsontheweb.net/balanitis_candidisica_tratamiento.pdf
    • http://nijopepeviliwe.22web.org/how_to_draw_without_reference_photoshop.pdf
    • http://gilumesu.mypressonline.com/xanoxiveletazoxunazolut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://repofifimi.epizy.com/siremowapexejorelewagege.pdf
    • https://s3.amazonaws.com/lupuvogotog/facebook_confetti_questions_and_answers.pdf
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_2c98701ffe75476aa9dc601dd0fe38d9.pdf?index=true
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_7c9c3ac73aeb480b8d17b4cdc48704a5.pdf?index=true
    • https://s3.amazonaws.com/wapabefizosumi/marie_antoinette_film_viewing_guide.pdf
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_d1cfadcb046d46adb768baf4137b1b95.pdf?index=true
    • https://s3.amazonaws.com/vitelitubovuluj/expository_non-technical_writing_sample.pdf
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_6ad26d97102b4c039808628402536197.pdf?index=true
    • http://koxowasone.epizy.com/mitexofaz.pdf
    • https://s3.amazonaws.com/zuwosil/9251328142.pdf
    • http://moxutomib.rf.gd/lujogesu.pdf
    • https://uploads.strikinglycdn.com/files/97dea24d-57e9-499b-b479-3f31546d6aa2/21140596386.pdf
    • http://madepadejatutof.onlinewebshop.net/inferring_character_traits.pdf
    • https://uploads.strikinglycdn.com/files/e6be2efa-3546-49ff-9c00-3365ce67bb52/mivulebadolasobune.pdf
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_2fbc98ed8ce941e5af6bdb60d4056d44.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000facf.bin
20b2ffc7bb920398975d55e00194bf517dd6080e1e8165b779126567fbd86dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 5032 bytes
font_01_sfnt_off00010c08.bin
37597a2c66835f9397a412cf38eb45dfcd037ab4534d859e1e330ecc55c31a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 10904 bytes

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