Malicious PDF — malware analysis report

Static analysis result for SHA-256 4768507de84cb9e1…

MALICIOUS

PDF

79.7 KB Created: 2021-04-10 18:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8bdae514ed161fc4491d39ba894ac89 SHA-1: 5cd11a88f581d23b18745e0dee490135c339e66c SHA-256: 4768507de84cb9e1b0e7853d1fe4c1e89b0a9277ab4773c25f06cb584c5462b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://leonvi.ru/strik?utm_term=nordictrack+cx+938+review
    • http://tublitalia.space/388016587310nhag.pdf
    • http://bekusasodix.iblogger.org/topographic_map_symbols.pdf
    • http://silafakujo.22web.org/dark_knight_returns_movie_wiki.pdf
    • http://strapslap.online/is_there_a_season_3_planned_for_big_little_liesy8s8c.pdf
    • http://gopagagoraxu.22web.org/what_is_ariels_real_name.pdf
    • http://venatavokawudo.iblogger.org/15323445211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_0b7be964fca84c1caef7cbcc89d4dc97.pdf?index=true
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_fcafaf986e354cc6be9bd8335bc5ebd7.pdf?index=true
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_f4a018ab546e494ca056f99ab43e7f6e.pdf?index=true
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_32c218219a924fa7a0d0a27015520546.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5512fc7e-350c-4cab-b1e2-7fbf9d6649e7/how_to_become_a_qualified_social_worker_in_uk.pdf
    • https://uploads.strikinglycdn.com/files/d3f37684-2b2d-4140-afb8-780a5a0289b6/74652726382.pdf
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_3e44e7080a9d4c96a97fa4a6af8a47ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4a382cc6-ca4c-48bc-b88f-3c025456b1d6/how_to_reduce_knee_pain_at_night.pdf
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_682bae8a189a472abec320d5aa60bdde.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e04cc81e-7136-4486-8dcc-112d150d2cde/attack_on_titan_manga_volume_2.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_e4f7eef4949a4135840db63a466c6abe.pdf?index=true
    • http://jenurinufaka.rf.gd/fuzewutipibuwuwigu.pdf
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_dc79fe94c53c479e8ed7582b84306a4f.pdf?index=true
    • 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_off0000ec37.bin
9d4159d90ab9253aba9b529908c4d5e9e194fc378ea90314013605cd2ee523d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 5172 bytes
font_01_sfnt_off0000fdf4.bin
fff466dabbf80781e610abdfe2c6c8516e7b92db0664755b1b9e97e22500fd6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 11044 bytes
font_02_sfnt_off000123c6.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 4324 bytes

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