Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9d179b942ace17…

MALICIOUS

PDF

74.2 KB Created: 2021-03-02 13:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e477dedff164019537f3ef9968cb2d67 SHA-1: e2bebb6ef1fda4288f2c78947e88a1c4605f46aa SHA-256: 7e9d179b942ace172a37ecd3aa6bc8bfb30c1197fdb4b30e8f470e255142fc15
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to "Black and decker coffee maker manuals", likely to entice clicks on the embedded malicious URLs.

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://crophysi.ru/strik?utm_term=black+and+decker+coffee+maker+manuals PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487005/normal_60128496bef92.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/what_are_the_main_traditions_of_christianity.pdfIn PDF document text
    • https://cdn.sqhk.co/rewaloxuruvu/4PoRmVE/2224318706.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxezitowefi/eghhhie/600_to_800_words_is_how_many_pages.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/dekitalalewowegapatilefup.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/us_attorneys_office_los_angeles.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/is_it_too_late_to_plant_tomatoes_in_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/gcgiiet/electrician_apprentice_salary_ireland.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/3Zgc0PI/95754429989.pdfIn PDF document text
    • https://bunonosuvon.weebly.com/uploads/1/3/5/9/135976801/mazita.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/can_a_40_year_old_man_build_muscle.pdfIn PDF document text
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/5584953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/what_are_the_features_of_the_moon_surface.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/california_association_of_realtors_residential_lease_agreement_2021.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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 5280 bytes
SHA-256: 9bbbab6efafcfc6196d2e621f5c6b0f31ca2809c1744f84868a8ff43597905d0
font_01_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 10596 bytes
SHA-256: 85c7ce9771e552fca20f235acb3cc8a68c020e66de5a9616d7165b511fce1b3f

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