Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc55edf4cb2ad103…

MALICIOUS

PDF

71.4 KB Created: 2021-02-22 00:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d44e2707e757b852d3b785ebe9cc7468 SHA-1: 25c23fa6e774c224dfa71ac7a82dcbfeee8bc5de SHA-256: bc55edf4cb2ad103649b4a7c7781143b0acaf30487808d0faf5aecc699fad761
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a mass external PDF link farm. The document contains numerous embedded URLs pointing to external sites, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links indicate a malicious intent to redirect users to potentially harmful content.

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://druttle.ru/strik?utm_term=is+it+possible+to+build+muscle+after+40 PDF link annotation
    • http://kovajexikimodu.iblogger.org/how_to_open_battery_compartment_on_nikon_coolpix.pdfIn PDF document text
    • https://katudiwuf.weebly.com/uploads/1/3/6/0/136006549/ninegonapa_banofifonemed_bizujexusitimuf.pdfIn PDF document text
    • https://cdn.sqhk.co/vetesomiw/jhCI3mi/stiker_wa_among_us_bergerak.pdfIn PDF document text
    • http://drilltech.info/amazing_mathematics_circumcenter_and_incenter_maze_answers24olw.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/zosidunubazozuwitad.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/limalo_gomabebapavukuj.pdfIn PDF document text
    • http://dunizajo.66ghz.com/84038068708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujawonevafo.rf.gd/kofarimeganekilodogon.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/jisesemigeneritag.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/simple_english_communication_sentences.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/nelujikuxaxajutedudo.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/xabukelejuwatezixapigo.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/wusepixogotivikitefakuw.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_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 5608 bytes
SHA-256: 8b03790aca345e8eef5840e8da8bee89ad4478f1399efa26f42ff3e52e4edc66
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 10292 bytes
SHA-256: edf34bf76c04e90e8c951e548b41a74c7554093ffdb42c998d7eab87c4a996c3

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