Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b5359feb335c32…

MALICIOUS

PDF

77.9 KB Created: 2021-03-18 17:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a3a9d1c7cf76dc828f4f33a9d21c787e SHA-1: e9a36f3c42bd8226d74ed3a8492b8f6fd8fe88cf SHA-256: a9b5359feb335c3266f55e54760b01590d78b84f0774bf318c1bd48da29c18f5
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are generated SEO-style links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+to+do+conversions+in+organic+chemistry+class+12 PDF link annotation
    • https://cdn.sqhk.co/jabupexipa/jhEifjd/zugikabexesawafe.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/7139279.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/difuxolazobu.pdfIn PDF document text
    • https://jepuderakemuso.weebly.com/uploads/1/3/4/6/134666912/a8f2e26302.pdfIn PDF document text
    • https://duxotitur.weebly.com/uploads/1/3/4/5/134596147/radupufero.pdfIn PDF document text
    • http://dusosax.66ghz.com/antivirus_android_free_senza_pubblicit.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/brhhFja/90414814686.pdfIn PDF document text
    • http://werisafijorarit.iblogger.org/77036799655.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/nefunupu/dupozo.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/16314738918.pdfIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_83209b3fab6a4c739b448f3e761e1c3d.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_9344c812810e481ba529cd7232509cf7.pdf?index=trueIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_0bfee0a320e44d689ad9de83bf90b119.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86c384c-070d-4b14-8939-e488543f2204/42112429687.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/du_bsc_chemistry_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1118329-5728-4589-8f8c-d89855266e63/3330801668.pdfIn PDF document text
    • http://xawezovixewija.epizy.com/aqa_a_level_biology_textbook_download.pdfIn PDF document text
    • http://tulafixobokov.rf.gd/facebook_page_verification_form_link.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_cd4e24d6ce0b4ec9a0b3a0cdbe8276e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/sakuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/tapabok.pdfIn PDF document text
    • http://lotewebikese.rf.gd/broiler_chicken_meat.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_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 5752 bytes
SHA-256: b8c47536c9cafd95b713b28f924cff04f28020c653b9b38e7c814c67002714ec
font_01_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 10904 bytes
SHA-256: 0bacc65f61c305eb2ba57b0d23e1a82fa5cb2d81ab04163b7407e6c5a8d74886

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