Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc34adf41cd35fe0…

MALICIOUS

PDF

66.2 KB Created: 2020-12-22 08:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4ffdf391824f6d7ebfaaea367fc39c16 SHA-1: bddcf87d81b8a2f212c90afd73f43b6d09cb7c4c SHA-256: bc34adf41cd35fe0c67795acfb7e40e84f02e60ca20b939e58f1cb22dbad8fa6
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and hosts external URIs, with one URL pointing to a phishing-related domain. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=nfl+week+12+weather+forecast PDF link annotation
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/d263807728fa7.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/valipuku-pinimaja-votipebap-falevutu.pdfIn PDF document text
    • https://buvudipugumop.weebly.com/uploads/1/3/4/8/134876529/mugadefabadodago.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/toxuridudere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_5fb38ce298827.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/rejiner/gezanuzadifugiloburexun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ea5162-8f4d-4c4e-a9f4-a471dda29c90/rusunowopafiwab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d523bfb4-7840-4b92-a484-25cb83f582d7/biseloduvenaxaxinufixiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65377cd2-a1c4-405b-a34a-b66e5b763e92/84319508066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e51592-cd96-48a8-bf01-967b4264b0dc/xbox_live_gold_code_generator_no_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0be136-a0a6-41af-8288-bf73f1efbf59/asrock_easy_driver_installer.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_off0000c5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B9 5276 bytes
SHA-256: 7bcfe78ada769ae54e16438930b27495dbc80b02367f9f3af38449a8e365fde1
font_01_sfnt_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 10736 bytes
SHA-256: e6bd69ccb774cd4827323876f2a49e779b8ff51a4bdc1ae6e4a33051cda513b9

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