Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6160d02a5ce8a16…

MALICIOUS

PDF

76.4 KB Created: 2021-03-29 14:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e51f8a4d40bb6a9d79051709f25791 SHA-1: aa0c7554474bf9808967d030677e029c89dc326a SHA-256: b6160d02a5ce8a16aa24f96a8217bd0251689ef199b67075c1a792e164c81f09
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with the primary one being a keyword-based URL likely intended to direct users to malicious content or a phishing page. The PDF structure suggests it's part of a link farm or SEO scam to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=chapter+4+standardized+test+geometry+answers
    • http://xutefizil.getenjoyment.net/spring_framework_reference_documentation.pdf
    • http://fezuzegipolekom.iblogger.org/luzebidix.pdf
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/2318623.pdf
    • http://kuroramogesok.iblogger.org/fake_medical_report.pdf
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/gurafagosimokar_fepekizu.pdf
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/tebutewavevis-fisasuve-zoperagagujoru-vediwovuruxajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d03f4f3-f350-4ca7-abd8-c334996f5fcb/material_science_and_engineering_callister_9th.pdf
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_0be22c15ea6948318019d5c131ab3ec7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a4bee40d-ea30-4d34-98e0-4177bab721e2/what_is_the_best_embroidery_hoop.pdf
    • https://uploads.strikinglycdn.com/files/755a4346-d6ea-4ed6-8f52-664fa1882210/what_does_the_black_stripe_american_flag_mean.pdf
    • https://uploads.strikinglycdn.com/files/8e586350-3c13-4603-8aeb-0443449a252c/sinister_diesel_6.4_egr_delete_instructions.pdf
    • http://zepizevut.atwebpages.com/2012_ford_mustang_shelby_gt500_coupe_specs.pdf
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_82866d9a58574c67973f42ed7db19b38.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c52c9215-35ef-46c2-b84e-de141eb6c626/the_bible_quran_and_science_free_download.pdf
    • https://uploads.strikinglycdn.com/files/51922037-a880-40de-968c-a45b69b2b080/dibujos_de_carita_feliz.pdf
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_8aee2b2d57de404c97880b5bc1758e44.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a26fc87a-a27f-416e-ac07-f290511e0080/zunopixaledazimimati.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea16.bin
f9714c5554c3b8fbad5531c2997a224004fa535528b45184ffae1db54d420921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 5576 bytes
font_01_sfnt_off0000fd02.bin
ea2b862594a8d570404a5e6935c4b5924df853a7993f16368bb904dcf247e1be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 11672 bytes

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