Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a63d9550f5c7f3…

MALICIOUS

PDF

69.6 KB Created: 2021-02-24 13:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9a07247866ce0d8fe735186149ed8191 SHA-1: 55f42ef1e25f30ae004cc291070b8e7fea236ece SHA-256: 81a63d9550f5c7f350c9a3db014f5c551ac29f16a2021cd29bf4bb79e513061b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to comparing grocery prices. The presence of multiple PDF links and a critical heuristic firing for a malicious redirector indicates an attempt to lead the user to malicious infrastructure, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+compare+grocery+prices+online In PDF document text
    • https://cdn.sqhk.co/kamozipu/mghihny/asian_bird_fair.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/fhbTXie/age_of_empires_2_strategy_tips.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/jiguxij.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/49nvhhX/patriot_off_road_roseville_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_6010847accd76.pdfIn PDF document text
    • https://sivajusirev.weebly.com/uploads/1/3/0/8/130814673/wesasixaberozikus.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/ih4hijc/81862508841.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/cFFbjaV/chest_simulator_workout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fdc89d577249.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/ijA4giF/lewujakogavevodigipunasa.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/piwanisaj/sanotedito.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/budget_2019_analysis_report.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_off0000d1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 5408 bytes
SHA-256: 374227d36442c48161f3be911427f9bf5a0c70371266894d78611e7a3378774e
font_01_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 11032 bytes
SHA-256: 5b12420064bfe82b347098b1c5b487d989b405bd66e5ec67031949c9332f1159

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