Malicious PDF — malware analysis report

Static analysis result for SHA-256 81979980f9cb60d7…

MALICIOUS

PDF

74.8 KB Created: 2021-04-30 10:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 38179e1a99ff8ceec0f028ac3135e1cc SHA-1: 5c9370c5affc1d4db87f23fdf6240254a76080a5 SHA-256: 81979980f9cb60d75f4e5b8c248d2efff005e75c69ed94f8b59050b4ba5d8a24
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this sample as malicious. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution, rather than displaying readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=siriusxm+sxpl1v1+onyx+plus+manual In PDF document text
    • http://xasedogamif.mypressonline.com/cancionero_catolico_navidad.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/namuvurifazidogapane.pdfIn PDF document text
    • https://xovonugobo.weebly.com/uploads/1/3/4/6/134688771/3380660.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/55aa2.pdfIn PDF document text
    • https://lobejimore.weebly.com/uploads/1/3/1/3/131383478/lovotefoj_sabomebesojuwe.pdfIn PDF document text
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/55b7b36240cd.pdfIn PDF document text
    • http://barurizex.iblogger.org/64226619106.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/zodawanuror/reggie_collier_net_worth.pdfIn PDF document text
    • https://229013d5-0e14-4531-be8c-43df84542e77.filesusr.com/ugd/e4a895_6919e7ed26c942eeafeecbac2e39274d.pdf?index=trueIn PDF document text
    • http://zokexobakinujez.epizy.com/73237011648.pdfIn PDF document text
    • http://nedolekom.rf.gd/jirufulokinixevijufesako.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/40501274429.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/dr_aidin_salih_gerek_tp.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/kuruputu.pdfIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_7eff2205433e46ac85b70525daea1aa2.pdf?index=trueIn PDF document text
    • http://xepivuze.rf.gd/makufusatovaga.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_cbc6630d8f814955baa51cf7f71111c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/how_to_reset_mileage_odometer.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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 5352 bytes
SHA-256: e762c6ba0b2cae2d3b3871df53e1420cd162bcc6b5966d896fd7c851945e905b
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 10772 bytes
SHA-256: ee4b1446a38768ed7cd64be7794afa237e3efd0586623011966aa4f9f53e6a72

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