Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdcaa159297875c…

MALICIOUS

PDF

79.6 KB Created: 2021-03-23 05:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51ca17bf2c47dce2e5d45e45faa34718 SHA-1: ecf86309396340bf23bdd438d99c409d16d888ce SHA-256: 0fdcaa159297875c547d70dbc224d7032a30965e68a1ea451c31be43459b1114
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it hosts a large number of external links disguised as SEO-related PDFs. One of the primary external links, https://golowaki.ru/aws?utm_term=why+did+they+change+the+ending+of+allegiant, is suspicious and likely leads to a malicious site. The ML classifier and ClamAV also flagged this PDF as malicious, supporting a phishing or malicious content delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=why+did+they+change+the+ending+of+allegiant
    • https://faxexivironi.weebly.com/uploads/1/3/4/0/134042341/6284452.pdf
    • http://foripekomufotir.mypressonline.com/anet_a8_plus_replacement_parts.pdf
    • http://xapaponagegite.22web.org/xolewowo.pdf
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/kuwebefus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a2179aef-d1eb-4c26-a111-0853631ba876/is_server_certification_worth_it.pdf
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_afdf65f54f894d888b2826d0655ce060.pdf?index=true
    • https://s3.amazonaws.com/xubifupi/27195600692.pdf
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_4321ce9e483647699aa03ebe207c4bad.pdf?index=true
    • https://s3.amazonaws.com/juvuraguvutoxif/covering_letter_templates_for_jobs.pdf
    • https://s3.amazonaws.com/mexijegedakol/geometry_basics_segment_addition_postulate_worksheet_answers.pdf
    • https://s3.amazonaws.com/fixararololu/31597183017.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_9a5ba8eae90445fe89902fd9f9c231fa.pdf?index=true
    • https://s3.amazonaws.com/jajuzasalikirut/ar_rahman_surah_audio.pdf
    • http://salalew.epizy.com/revue_d_assyriologie_et_d_archologie_orientale.pdf
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_9e11a5b67a294f77b38d9a9ae1900a38.pdf?index=true
    • http://sajomapujozokux.onlinewebshop.net/what_are_diagnostic_assessments_in_education.pdf
    • https://uploads.strikinglycdn.com/files/10bcb062-6930-4426-a661-954115a92bc3/66944379787.pdf
    • https://uploads.strikinglycdn.com/files/cb0e66a9-f3cc-4dfb-8dbf-b9ca877373d0/optiplex_790_core_i3_specs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed56.bin
37f5b7edd777f6d7390a5bf508d5058e34de6980c64a84efcd61753cd42950bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 4912 bytes
font_01_sfnt_off0000fe1b.bin
ed6657bff84ff449aa2b8835ab590d5937502842fa70139f0c45197bdc9bf1d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 11016 bytes
font_02_sfnt_off00012327.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 4324 bytes

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