Malicious PDF — malware analysis report

Static analysis result for SHA-256 41be6b586c9d57df…

MALICIOUS

PDF

72.7 KB Created: 2021-04-01 10:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5bcbebbcdb6ccb10fd1be3ab847361ef SHA-1: c85bb655f17d6d834e731c26b8048276f8b31621 SHA-256: 41be6b586c9d57df045a78d5efdd62cf92adbdc700394d609fba30c69bf4a5f0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting a phishing or SEO poisoning campaign. The primary URL, 'https://seumenha.ru/wix?keyword=process+improvement+and+change+project+presentation+ppt', is likely a lure to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/wix?keyword=process+improvement+and+change+project+presentation+ppt PDF link annotation
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/71fcb9c15ea0.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/tivusivodasevugizomisera.pdfIn PDF document text
    • http://zusetuwegu.22web.org/wixaxuwironelulep.pdfIn PDF document text
    • https://jelaxatibepa.weebly.com/uploads/1/3/2/6/132681396/6004324.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/gchegdq/building_services_engineering.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/9hhgf92/loxobobojazuvaz.pdfIn PDF document text
    • https://cdn.sqhk.co/suwenadikum/hOraDhf/racing_karel_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/7jhsghX/xipopidurekonor.pdfIn PDF document text
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/b525e.pdfIn PDF document text
    • http://vuletotam.scienceontheweb.net/learn_hebrew_alphabet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_9411c404c03a469a8d75d09dc336d0f6.pdf?index=trueIn PDF document text
    • http://fazegixedibuw.rf.gd/what_is_the_social_contract_theory_of_thomas_hobbes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32273d4-7a6e-4510-bfee-ed2e900ca60a/29422243142.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_0bd8376c63a3438f8696e2a3f65d5c3b.pdf?index=trueIn PDF document text
    • http://zamonile.epizy.com/89014344422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc78c66f-733e-43c4-82ce-e28cf958dc01/scag_mower_prices_2021.pdfIn PDF document text
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_df72dab2ad4841fbad62a28f4315cabd.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_9366dfa497844e6ab5f7df728b1f990b.pdf?index=trueIn 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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 5592 bytes
SHA-256: bf6ac4a65a69f76eec710bc48fa8529df0e75f49fe39db6a36511a49a9267117
font_01_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 10744 bytes
SHA-256: 7848e20b60a13405d0594ec4611aeb189a973ab0bb2dc7e5eaa13e041cc9c741

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