Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a3e4d587340117…

MALICIOUS

PDF

73.9 KB Created: 2021-03-04 00:24:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 528e12ee13d1c5da3e4f2318b2bb1b98 SHA-1: 14c856f348a544d48a6511932a02429f161136ce SHA-256: 12a3e4d58734011757bd6bdb65da78d3b20cd884f86871553e05830832fab85b
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('baarspo.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious purpose, as it indicates the PDF is a link farm hosted on disposable infrastructure. No scripts were extracted from this sample, but the presence of multiple external URIs strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/aws?utm_term=how+do+you+explain+prepositional+phrases PDF link annotation
    • http://desajegurake.scienceontheweb.net/susimoruvaxew.pdfIn PDF document text
    • https://wotopegajoxife.weebly.com/uploads/1/3/4/0/134042499/pozokodudob-denef-korilin.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/i4ugibr/1415812759.pdfIn PDF document text
    • https://godebisexizo.weebly.com/uploads/1/3/0/7/130775633/5540261.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/YMbdjdv/sears_going_out_of_business_sale_2019.pdfIn PDF document text
    • http://zupuvotan.22web.org/67144306318.pdfIn PDF document text
    • https://cdn.sqhk.co/rejelozekazo/bBmVKhh/5152466800.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/9nQhjgj/sims_4_jungle_adventure_world_not_showing_up.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badivisixeg.epizy.com/livineko.pdfIn PDF document text
    • http://zupukafejobe.rf.gd/free_fashion_logo_templates.pdfIn PDF document text
    • http://pugagewuda.rf.gd/how_do_you_determine_the_reaction_order.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/aristotle_poetics_analysis_shmoop.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/78224581662.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/38640674559.pdfIn PDF document text
    • http://gozegatunefafet.epizy.com/kenmore_dishwasher_kick_plate_installation.pdfIn PDF document text
    • http://temidegizesoweg.rf.gd/dc_shunt_motor_problems_and_solutions.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/section_138_of_negotiable_instruments_act_latest_amendment_2015.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 5272 bytes
SHA-256: f1933d74cebebdf85a3d2c912a3072e60c39b61ac4329a2929624d7ced399c7b
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 10428 bytes
SHA-256: e68c5fad13883a80da66ac7af35088dacab5516e2383753b450472da1400f22a

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