Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdf35f81b9b2553…

MALICIOUS

PDF

80.0 KB Created: 2021-03-19 07:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f9ea9b91e985683113e9dd6c8c22b6f3 SHA-1: ed79980ea67ee660403202cf490e1c81dcc2bb6e SHA-256: 1cdf35f81b9b25533f92daae090eef56a073896559fb5ed1abf4b2dfd83a7a14
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=what+are+the+rules+for+free+parking+in+monopoly PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5ffe22ff3cf9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fcb7b5bcb61b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_5fd165f1c5590.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/fiwofebudet.pdfIn PDF document text
    • http://weridif.medianewsonline.com/aladdin_broadway_musical_script.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/bingo_game_rules.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fff0d9890489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fe3170ca52ad.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/chicco_keyfit_30_stroller_car_seat_combo.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/present_indefinite_tense_examples_in_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401989/normal_602061f1b836f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_60194c82d7d74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac46b31-1463-4bd3-9548-6de084c74d27/52954282952.pdfIn PDF document text
    • http://xabetalofel.epizy.com/54084197767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175ebcd9-b6ea-4a67-99eb-4a01426cee02/farberware_air_fryer_toaster_oven_fried_chicken.pdfIn PDF document text
    • http://dewabop.rf.gd/lord_of_the_flies_chapter_1-3_quiz_answers.pdfIn PDF document text
    • http://safadixuzet.rf.gd/phonics_worksheets_uk.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_4249fb4420c4470b85b7c1a89311d66e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/894feb31-0ef1-44bd-8c34-38f12ddef11c/32429092641.pdfIn PDF document text
    • http://pexevogawi.epizy.com/59635101893.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_6b09ef06b59a4f2c9dfb1ec1e51b059c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/129662ee-c2a4-4e74-85eb-c3669c3ecfda/kenmore_convection_oven_not_working.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_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 5492 bytes
SHA-256: 6d8174c99c3fdcc318faa79fbeb1b46cf081d38926c3ca735d3ea2c632d17dfa
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 10968 bytes
SHA-256: cc0ea2429401b9201688e421c5a40fd4a2a64673316a6b6983a5d717b9f38cec

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