Malicious PDF — malware analysis report

Static analysis result for SHA-256 e153f81d522c3fe4…

MALICIOUS

PDF

81.1 KB Created: 2021-03-13 14:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2af7457890e1b7c05d0e96393f8722c3 SHA-1: d2b013857368347b029c6091ba31dfb89306822d SHA-256: e153f81d522c3fe4bfe1dde28fcbf97b782b633b3008c92fdeb7bc58d4a7e5ce
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially malicious content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=weathering+worksheets+6th+grade PDF link annotation
    • http://believes.space/78925066513lnc8w.pdfIn PDF document text
    • http://unreguezff.rest/what_age_rating_is_six_of_crows8iy1l.pdfIn PDF document text
    • https://cdn.sqhk.co/relaberof/0ijbOas/68857909963.pdfIn PDF document text
    • http://reduslim-siteofficial.site/nueva_gramtica_de_la_lengua_espaola_raepbaiy.pdfIn PDF document text
    • http://whysmall.space/nobatezobuvixevum55t0.pdfIn PDF document text
    • http://espaceabonnes.com/biology_of_schizophreniacw21q.pdfIn PDF document text
    • http://soinjaga.ru/black_hawk_down_a_story_of_modern_warku27p.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/9Gih4Xw/open_puzzle_box_game_level_9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_51411e8f1a92425b9b3394461d807611.pdf?index=trueIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_a65dd6b069f744f1836af4f60bfb725c.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_0f152f82d77040478e8359484b7b943d.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_e1106ff1fb7d46b3844194e4e619235c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/12066485549.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_894b3336eb234cbdbda2bc4f9cf83d43.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_80b0a375846b42368c7e9b4f7c58eeea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/animated_hd_wallpapers_for_android_phone.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_2ed778b1e40d4a7fac31af1ae3b23ae1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/zuriwevosaxag.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_91b5c3608830418ca83ed60bc2260370.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_a63651f7721545edbfb2ff58a170c62b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/70809356883.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_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 5376 bytes
SHA-256: 5231b2ffcd4d52f15e282f91780e0456ca1e69b6803dd94c5fd85eaa45cd6134
font_01_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 11452 bytes
SHA-256: 737ca710c040d452836b0c9625ee363bac13fe5cbc92e8fdca86e99fb698d70c

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