Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf53946bdab13eb…

MALICIOUS

PDF

65.5 KB Created: 2021-02-18 22:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 07a7de580dc4a1619d5d5b48e7adc873 SHA-1: 26991d75d901282dc5eb554233b25f61cdb96f70 SHA-256: ecf53946bdab13ebae65bb2d814a6de5f5215cd2113433a5e02bf1b88c017c83
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. One of the embedded URLs, 'https://baarspo.ru/123?utm_term=liftmaster+model+3800pld+manual', is likely part of this scheme. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://baarspo.ru/123?utm_term=liftmaster+model+3800pld+manual PDF link annotation
    • https://cdn.sqhk.co/nuxoporerom/Cghjb5R/78015396856.pdfIn PDF document text
    • https://cdn.sqhk.co/jijipidub/ihcdijm/commercial_property_for_sale_in_the_caribbean_islands.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5fd2a8c5998e4.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/cjfggid/staph_infection_symptoms_skin.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/lgdp5ig/liligiroxafij.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/ifomsgg/rocket_royale_game_apk_download.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/6836315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_601e5705f27bd.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/iijc6WQ/free_cardboard_recycling_pickup_near_me.pdfIn PDF document text
    • https://nidukonijeso.weebly.com/uploads/1/3/1/3/131381088/48f465349.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/kgjhggj/ridge_retro_mini_cruiser_board.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gvT2noR/drift_war_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/ifrjjic/dafevewozazuwoza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fee13bed318f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_600aa04d8c20a.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/lemukogiwax.pdfIn PDF document text
    • https://nikonewakudofu.weebly.com/uploads/1/3/2/3/132303001/6aab355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_60295937f1f24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fd03968d664d.pdfIn PDF document text
    • https://mixodozom.weebly.com/uploads/1/3/4/3/134333910/vowiver.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5ff8c3625d72c.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_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 5628 bytes
SHA-256: 62eb857356c2a6934f8321618167d88e0b9ff4c49e85c9fde28bdc605f68c74c
font_01_sfnt_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 9776 bytes
SHA-256: e92ba71e64ff5411dc49565886d0617381d8e569146ac5a7ddf4b38805a54dc3