Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd0575438a73cb4…

MALICIOUS

PDF

81.8 KB Created: 2021-04-02 18:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c1b901ed53d00d9cb037446eac9650d5 SHA-1: f72faf88df46ce2944e025bf8c602b0d39ad6ae1 SHA-256: 2bd0575438a73cb4ec3fb3d8228295493f76b222682ad4b277c31ed58d9a12b9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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/award?keyword=space+maintainer+pdf PDF link annotation
    • http://kulilezew.iblogger.org/69115463072.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/hcbYphf/bofeful.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/zw6SgfV/wheelies_bike_shop_medford_nj.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/nsou_assignment_front_page.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/81744655092.pdfIn PDF document text
    • https://cdn.sqhk.co/komilede/jihbZib/slack_salesforce_deal.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/gfginid/kuxora.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/potih24/mobile_truck_electrician_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/ibjdTWZ/76424097073.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/Bhcuodc/kuvilewugonegilokefepax.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/gfign7z/92390061875.pdfIn PDF document text
    • http://bagutoruramig.mywebcommunity.org/chomsky_syntactic_structures.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_e6fb8ff3280c4403be93ebf03add2f15.pdf?index=trueIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/fobuxomuzutoseralafoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57283090-daa8-4792-b4fa-d90021421b55/motorola_talkabout_ms350r_2-way_radios_manual.pdfIn PDF document text
    • http://terajupatasan.rf.gd/1133458814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d396bc73-3c21-48fc-a26a-f7ca0e6dcea8/rehras_sahib_path_download_in_hindi.pdfIn PDF document text
    • http://suboxasolu.rf.gd/chhaya_prakashani_physics_books_for_class_12_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ffdd21-a439-4a99-8fcd-6b045d6a3275/tijejavebetebabet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252e41af-6858-48f8-9dcd-7590bac22f2c/what_is_the_average_salary_for_health_information_technology.pdfIn PDF document text
    • http://dozokefonusabo.rf.gd/algorithms_illuminated_part_1_the_basics_tim_roughgarden.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/ropolamasujekufolidumeviw.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_e0bd82a69fb7488d8de825032c9294ae.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_daa83c6548074427acbf0207baac8082.pdf?index=trueIn PDF document text
    • http://ruvilex.rf.gd/90165808512.pdfIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_900aedf7faaf4dccb29b67a4ffe99ded.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04472990-11c4-4430-a425-ebbcc3b48bdc/99836645756.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_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 5192 bytes
SHA-256: fde99e72e875347a7f214b37185d5ea598747fd0d62e97ad43f93df04c5c1fe1
font_01_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 11480 bytes
SHA-256: 53595ff7addfcc57c2c50fd925778e372940bab113ecddb07a737c72b74680df