Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac35be5fcefe04e2…

MALICIOUS

PDF

68.9 KB Created: 2021-02-14 23:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 82c44d4b3c7723396863edbe9f10adc5 SHA-1: 69e3d5b4ee9a467446281b9000bb0d50aba4888a SHA-256: ac35be5fcefe04e266ae7868c7123544458b4f1034c714136f325b7f3fa43eef
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a malicious payload or redirect users to phishing pages.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wix?keyword=physics+chapter+7+momentum+review+answers PDF link annotation
    • https://cdn.sqhk.co/bomoxale/iaPgeNg/25122316513.pdfIn PDF document text
    • https://cdn.sqhk.co/jetekujob/djfejiQ/color_splash_wallpaper_1080p.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/5927102.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/32b444f8cde.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/rovat.pdfIn PDF document text
    • http://salet.store/95444803123fo1ao.pdfIn PDF document text
    • https://wiwunofubej.weebly.com/uploads/1/3/4/0/134012322/6755331.pdfIn PDF document text
    • https://nozoporunetub.weebly.com/uploads/1/3/0/8/130814805/tezowitivo_zewusagoniduga_mobepev.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/a7ig5hb/dead_effect_2_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/jQhhehi/90367882594.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/ghvhds0/20393067528.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/5kbKhgX/contact_lenses_halloween_prescription.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/jenagubadopi/precalculus_with_limits_3e_chapter_5.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/ak_47_wale_khalistan_song_djpunjab.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/login_template_bootstrap_responsive_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/34305566393.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/grammar_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/certificate_of_appreciation_template_free_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/2nd_year_date_sheet_2019_malakand_board.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/nosuv.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/87606926530.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_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 5476 bytes
SHA-256: a9c3ce82871f5fecd8070b17f44e181679ad98d33bb4be7d8805478c2e8169d7
font_01_sfnt_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 9796 bytes
SHA-256: 11e64dc04f03b9e4fcb91aa587691e654ab643a313ce4f21f68e29081dc59ed7

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