Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c677aa8ae72822e…

MALICIOUS

PDF

71.8 KB Created: 2021-03-07 14:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: dc1585b426cdc8acb34a9cc4cab605f1 SHA-1: 512c0b14a0698e2398a9d4f869a261561ab26a9e SHA-256: 6c677aa8ae72822e6ee5fa0cc9ca161e9fc36f8acc96ede9c6e03fa934803c16
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, 'https://seumenha.ru/wix?keyword=antecedent+worksheets+for+grade+5', is likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external links and the overall detection profile strongly indicate malicious intent.

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
  • 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://seumenha.ru/wix?keyword=antecedent+worksheets+for+grade+5 PDF link annotation
    • http://max-lifting.store/what_is_the_central_theme_of_call_of_the_wildk6jdb.pdfIn PDF document text
    • http://kinoxca.xyz/3331358041byego.pdfIn PDF document text
    • http://sumemejosanavo.iblogger.org/fixed_cell_reference_google_sheets.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/mubefula/back_formation_meaning_in_punjabi.pdfIn PDF document text
    • http://mulunatebena.epizy.com/31043628455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc778ac7-8046-49d1-bea7-4ff87ca0dc7f/24408215666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8502fea5-4476-4061-be49-8311a4d17038/are_fan_heaters_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073ad93a-3a28-4c4e-8d00-1c4f8e48cc52/how_to_replace_trimmer_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cedc08b-8084-431d-817d-ff5b6b4fd486/feats_to_increase_ac_5e.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_6643a2512da1477ba2d4895129df8d97.pdf?index=trueIn PDF document text
    • http://wowidetijajed.epizy.com/cebu_pacific_pilot_cadet_program_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/zugitexajejamugogani.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/apollo_munich_health_insurance_agent_application_form.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_50f59cc88e964060bdd269cf5ee17719.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisik/black_and_decker_jigsaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/zirifiwulut.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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 5520 bytes
SHA-256: 9b2006546f4e78ab3fe8f7b80245a31dd31097578171fdb7427e8554f946ad42
font_01_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 10492 bytes
SHA-256: 04cdf095a83c3c8e19b7ade697f9ea3f8a8041df1296f6d3a85088a90c04d092

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