Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b87914862179f6c…

MALICIOUS

PDF

78.0 KB Created: 2021-04-07 04:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd87668c4eb66fde91b970cc586eb6ff SHA-1: 6cc2d887014e1153b631068c081ff3a42e2230ce SHA-256: 5b87914862179f6c3a86fd1ea7b6267ff696f2ee02d5eacf34921c971f8c1541
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 pointing to other PDF files hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=literature+review+in+research+paper+sample
    • http://pixelbarista.com/ninja_professional_1500_wattszlkcv.pdf
    • http://select-get.top/buwimigenevuvaxigopuo9rqt.pdf
    • http://winoorama.website/19139998082k05sz.pdf
    • http://shimano-stradic.ru/stephen_king_movie_11_22_63q8h7r.pdf
    • https://nipixosawapur.weebly.com/uploads/1/3/1/1/131164079/9331097.pdf
    • https://vofamebibefa.weebly.com/uploads/1/3/4/6/134694090/4c344.pdf
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/4296306.pdf
    • http://winoorama.website/how_to_write_interview_in_essay_formatjqyqd.pdf
    • http://contact-git.top/endocrine_society_of_sri_lanka_guidelinese3rly.pdf
    • http://ideaita.fun/what_are_the_requirements_to_be_a_navy_pilotcno0h.pdf
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/gazipufe.pdf
    • http://chambre.xyz/how_to_update_lowrance_elite_tibn2ha.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_e9d5b73ffd1d43d6a44b51d2a92af004.pdf?index=true
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_7c898cbf54c24403ac24365ada2bad6e.pdf?index=true
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_96757abfd9a3463aac9cd2d829fdd9b0.pdf?index=true
    • https://s3.amazonaws.com/fikuvine/tazazesuxulo.pdf
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_05b753b85cad42868d17987381011016.pdf?index=true
    • https://57e596f1-a2cf-4e3c-9ba9-dc8e42e7d639.filesusr.com/ugd/1e1da7_bb2ebd9290c24336a8da0d48033cf7e8.pdf?index=true
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_82ec6e1de01d496ab39440066351e037.pdf?index=true
    • https://s3.amazonaws.com/mipeboro/quadratic_function_graphs_worksheet.pdf
    • https://s3.amazonaws.com/fekaduvopigab/7th_grade_civil_servant_sub_indo.pdf
    • https://s3.amazonaws.com/novipaliwid/ryobi_router_guide_bushing_kit.pdf
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_7ea763d3657941de9b9f858a468906e5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e545.bin
ccf4f353d1540325d40c74ccf8706b226d52e7a01a199f9b9b1418a8eff67dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 5040 bytes
font_01_sfnt_off0000f648.bin
c250913ec3a6017f9dae99d49ff8f8111648ecc290faee0f83453aefe9b07abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 10660 bytes
font_02_sfnt_off00011aa6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.