Malicious PDF — malware analysis report

Static analysis result for SHA-256 d385aa7605f006df…

MALICIOUS

PDF

83.4 KB Created: 2021-02-01 19:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ffae977f74ed9aebff3f70cd07847380 SHA-1: 91bbf4fdb4faf1c616f39095abc0df348ff8db9a SHA-256: d385aa7605f006dfc51cd8a3af8dd760c4ae2ce8a212bdad6e3485461c257621
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to redirect users to potentially malicious content. The presence of a known malicious redirector URL and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a phishing or malware distribution campaign.

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
  • 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/123?utm_term=northeast+corridor+train+stops+amtrak In PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/vupiparojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5fcc82a466cd2.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/6333827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_600c147ba2981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5fe58ee2e0f92.pdfIn PDF document text
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/223724.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/uIggie5/stupid_zombies_circus_day_58.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ighg9ij/foxtail_fern_in_flower_bed.pdfIn PDF document text
    • https://jonaditogun.weebly.com/uploads/1/3/1/4/131408899/mefagagepud.pdfIn PDF document text
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/9727180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5fe9ee21a64a7.pdfIn PDF document text
    • https://cdn.sqhk.co/raguwubives/j3Qhhv6/monster_high_music_festival_venus_mcflytrap_doll.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405194/normal_5fe099618174c.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/Znyf2E9/hindu_paper_horse_racing_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/gidEihu/map_among_us_mod_always_imposter.pdfIn PDF document text
    • http://vefavirona.22web.org/kufidafofasituvo.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/jbhepgh/marketing_means_promotion_and_selling.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 5312 bytes
SHA-256: dbeea3b6a3b36e4e7b2c8414b6d1783c5a8a895a8c9f728904fa2a40271c7ee9
font_01_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 11304 bytes
SHA-256: c68288cf212de0205289cf1d35b2f235a8c2972df04991c3e444e36952015459

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