Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ba3a1bdee51858…

MALICIOUS

PDF

73.4 KB Created: 2021-03-02 04:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 46ac7f9fb1c541d72c120a6bf6817e09 SHA-1: 9cfd1a14b0d321d752afeff8a679074fa97865c6 SHA-256: b4ba3a1bdee51858fef5fde1df803155c9f12457c2f0dcdb07d88cffe4e93b71
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an embedded external URI and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL, 'https://midufefew.ru/strik?utm_term=john+deere+x324+mower+specs', is likely used to deliver a malicious payload or redirect the user to a phishing site. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URI suggest an attempt to exploit user trust through a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=john+deere+x324+mower+specs PDF link annotation
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/3112a68c36d9.pdfIn PDF document text
    • https://cdn.sqhk.co/gidurekigov/hidhi3Z/ball_sort_puzzle_level_1455.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/Sihhihj/33335112910.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/ghhgcie/61419868434.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/iFAPjbv/36057762531.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/ozYgf2H/fobidovazijirafilodagawu.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/poema_del_mio_cid_personajes_principales.pdfIn PDF document text
    • https://paterixif.weebly.com/uploads/1/3/1/4/131454766/gorodakaxokidunoxup.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/0CfVii1/super_fancy_pants_adventure_world_4_part_1.pdfIn PDF document text
    • http://online-bestshop.xyz/remasuty0hv.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/ngdjgie/ninjago_season_13_episode_13.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/jazamerijekufol/80449125392.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/67748766926.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/real_flight_simulator_free_for_mac.pdfIn PDF document text
    • http://jowosos.myartsonline.com/47559286072.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/africa_del_norte_paises_que_lo_conforman.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/nassau_county_family_court_information_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_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 5604 bytes
SHA-256: db397c9be9b1cfe5c875dcb76b616b255944c8ea86c69f5f3b7326008541e12b
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 10828 bytes
SHA-256: 72b87db5d566311bd10e786b617554cecd8f71e29838f1853f9096ce83e71710

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