Malicious PDF — malware analysis report

Static analysis result for SHA-256 32244fa2137b3fe6…

MALICIOUS

PDF

82.7 KB Created: 2021-03-15 08:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 14fb5f34f93d240d480e4f4d01e35c0a SHA-1: 294dbd7a58d168920c7e914720a0c4f5561472d2 SHA-256: 32244fa2137b3fe60a28a679be5ebf62e4eccaaefc207a8ddfbe6ad84881ae8d
244 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded URLs, many of which appear to be part of an SEO link farm. One of the URLs, 'https://crophysi.ru/wix?keyword=the+spectacular+now+online+freefilm', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=the+spectacular+now+online+freefilm In PDF document text
    • https://pekiwuvigefarov.weebly.com/uploads/1/3/4/7/134766825/5396368.pdfIn PDF document text
    • https://mubafuzolifuben.weebly.com/uploads/1/3/4/6/134644730/8633992.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/29663741004.pdfIn PDF document text
    • http://mikrotikwizard.com/is_anti_inflammatory_diet_good_for_weight_lossen079.pdfIn PDF document text
    • http://osummer.space/vifelagakiloponokuketipbbhux.pdfIn PDF document text
    • http://polikarmonolit.ru/xewosikonutag1bvd.pdfIn PDF document text
    • http://xunarepozufuz.mygamesonline.org/scientific_calculator_functions.pdfIn PDF document text
    • https://telewebejuta.weebly.com/uploads/1/3/1/6/131607630/fugadi_zupik_gelokaguxapi_monok.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/pdf_harry_potter_printable_activities.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/18899855005.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/8638512.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/raviser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_2c645f5bc6db4439a0e2e763e6bff250.pdf?index=trueIn PDF document text
    • http://xidafusotiba.epizy.com/90718193998.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_056cf882f4f4464d9cd4cdcacf609ae2.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_fe9872653b484a78b1e839bc87f03a8d.pdf?index=trueIn PDF document text
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_864cc435b35c41aea9108f35710e26a0.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_a275c285b38348a5ae1da245b7539f60.pdf?index=trueIn PDF document text
    • http://jasebusezazov.rf.gd/25875296231.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/harry_potter_goblet_of_fire_pc_game_free_download_full_version.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_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 5296 bytes
SHA-256: 0b55f82247b702c1cab7f5c5ee57a65c119d53585485efcf5c9704a450d42e01
font_01_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 11388 bytes
SHA-256: 48e2e4f15cae9eedf8a61544299adf909a13affd97bbb8503257c3e5ee12390f

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