Malicious PDF — malware analysis report

Static analysis result for SHA-256 687f70add8244f0a…

MALICIOUS

PDF

71.3 KB Created: 2021-05-21 18:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dccc5d082daa3218ef0bdba9b0d27b4b SHA-1: 27372694b33a0f6d7808720733bca9510b0d71f4 SHA-256: 687f70add8244f0ac6209e6194b8d9adf094afffa8b1cef13bff491881487ed8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external links, with one prominent link pointing to 'https://jumiwimov.ru/strik?utm_term=percent+yield+problems+worksheet+answer+key', suggesting a phishing lure. The PDF also hosts a link farm with 30 external PDF links, indicating a potential attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes.

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://jumiwimov.ru/strik?utm_term=percent+yield+problems+worksheet+answer+key PDF link annotation
    • https://gagopono.weebly.com/uploads/1/3/2/6/132681316/duxuj-wakobut-melad.pdfIn PDF document text
    • https://dixamagajo.weebly.com/uploads/1/3/4/6/134652312/60af28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_60125618916cd.pdfIn PDF document text
    • https://nizovekakajet.weebly.com/uploads/1/3/4/7/134740669/295538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_606c2f9a4e3d2.pdfIn PDF document text
    • https://sivipafegedijog.weebly.com/uploads/1/3/4/4/134443607/sovujageloraxisukek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/698e3c21-40d8-4b54-a19e-528bb1c9e250/kizapaxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2fc39a8-6038-4f24-9169-2ce5855dab0a/5116664995.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/87945482353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d64698-60c9-4039-ac43-bbd52f73a631/dell_2407wfp_monitor_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185c5e35-cdf4-433f-8943-1ec8ed11c92e/how_to_make_veggie_burgers_from_scratch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c899a2b5-f547-45a2-a6f9-9486e196508b/nojabepomakuvagoxafik.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/2010_lexus_rx_350_front_bumper_replacement_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/warunatofezutitumute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8dc252-19c6-4cc1-801e-824c226e277f/57681186795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b5eaba-ce71-4c69-8d97-b07a70c7418e/why_was_reconstruction_a_failure_yahoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6873fd97-291f-4eba-9c44-fae084b2987f/39915823605.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/liferay_6._2_developer_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0789b0-ae39-4c78-bfbf-6213d4f7a8c8/how_to_do_enlargement_scale_factor_0.5.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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 5712 bytes
SHA-256: 90abe2a5c16023360f692f93d7f2a2c34701d300181aa8cfb0525172d1d21fce
font_01_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 10288 bytes
SHA-256: 0cab587a07f2186303e2f8a46acdc429d7e11c996218cc7be7d15d6ce435504e

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