Malicious PDF — malware analysis report

Static analysis result for SHA-256 77935b69a097e687…

MALICIOUS

PDF

69.0 KB Created: 2020-12-16 13:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b3dcc538f0bf421c9bbdadad97b378a1 SHA-1: 86c8e46437399c4c39a612c5ac13caf77a6cb7e1 SHA-256: 77935b69a097e687dbd86beca52d04e87ebba17c0d670ad2648af6e9f02c3822
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically highlighting the suspicious nature of the embedded URLs. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect the user to potentially malicious sites.

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://trafftec.ru/123?utm_term=montgomery+little+league PDF link annotation
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/6267868.pdfIn PDF document text
    • https://lesavudipuvu.weebly.com/uploads/1/3/4/3/134338744/pulavewisadadarur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f96f6e65a204.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/gidibesuxi/personal_loan_agreement_format_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58136db9-a045-47e8-a218-e6255eb4509b/pojinoditorowuta.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/doravatul.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/blitzkrieg_2_free_full_game.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4e10827a199023aceea85/t/5fc69d7bf8cdb769c6cc06a2/1606851964620/diwixutikugerubin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23faf7dc-4806-4f5c-94f6-eaece4f13a79/21305429210.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfd6a9d104e5f152dfe28/1606221162872/tommy_hilfiger_th_1985_watch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f34c41-40e8-4484-81d2-a574a18338b4/wii_motion_plus_remote_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/octagon_4d_cards_free.pdfIn PDF document text
    • https://s3.amazonaws.com/padoragog/ladisubif.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_off0000cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 4936 bytes
SHA-256: 4783a82bd5c496acb0d6297d7fac3fd56248ecf94ba86392318b6f69f2f4262b
font_01_sfnt_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 12416 bytes
SHA-256: 8e6f3625a6030b9d6cd8f03c5c8a34869379e31e2189908f1d5e05d863602dec

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