Malicious PDF — malware analysis report

Static analysis result for SHA-256 88645ae351287246…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 17:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71389ceba6f3635d775a9a4808ac0bad SHA-1: 86f1c8146e66b9662f94b3687bdd5dbc1afee0fb SHA-256: 88645ae351287246b51c29043afe94f7090b3711d8d03c62b969cc3c2e95b6a3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by ClamAV as a phishing trojan. It contains numerous external links, with one pointing to maypoin.ru, suggesting a phishing or malicious redirection attempt. The presence of embedded JavaScript, though not explicitly detailed, is common in such malicious PDFs to facilitate redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://maypoin.ru/award?keyword=bookkeeping+manual+pdf
    • https://cdn.sqhk.co/tefazaturar/71bLgjM/workspace_one_intelligent_hub_download_mac.pdf
    • https://fuwemuwiwogul.weebly.com/uploads/1/3/4/0/134016804/22b541.pdf
    • https://static.s123-cdn-static.com/uploads/4419211/normal_5ff47a9dd5125.pdf
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/mekujorekivovulixa.pdf
    • https://cdn.sqhk.co/gupikekarobo/Ajhdgfe/firecracker_sound_effects_loud.pdf
    • http://bighome.space/international_business_college_lubbock_texassvqur.pdf
    • https://cdn-cms.f-static.net/uploads/4465274/normal_6011c1faf3232.pdf
    • https://cdn-cms.f-static.net/uploads/4468812/normal_60278658463e9.pdf
    • https://cdn.sqhk.co/tunuviju/jghagv1/century_21_hours.pdf
    • https://cdn-cms.f-static.net/uploads/4496828/normal_600aabb7d0daa.pdf
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/kiripar.pdf
    • http://eyebrowthreadingdallastx.com/wujowodowejxhc5.pdf
    • http://idealica-italiaofficial.site/nyu_winthrop_occupational_health_services0zac9.pdf
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5ff5764da4096.pdf
    • http://musc-media.xyz/52303087082nne5.pdf
    • https://cdn.sqhk.co/govonesed/jjmhbhi/the_light_phone_2_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_26297fb902c4481b99551e7504a4af2f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d49391a7-9563-4beb-b5b5-da01a455f1c0/gijewerojedu.pdf
    • https://0face946-3507-4f1d-9804-30df5ac990e4.filesusr.com/ugd/8dfcc1_253a9266a97449a09feac9c495f59d88.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b256c1e0-ba9c-4528-b9ae-77f978d4dc96/35761658541.pdf
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_c8986e5abd2747ba90be99f75bddd364.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8315dde8-c5fe-42c7-9070-87a49d3099ff/pexizedamezixu.pdf
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_3e77993c6fc9457db060c4e208258967.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0d2cfa53-69ad-40ff-be81-803b03296a52/insinkerator_waste_disposal_air_switch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23b.bin
c05a763d64602abb621b168c7578205454b15d178d03c4cf438aca46abcde847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 5200 bytes
font_01_sfnt_off000103e6.bin
c63835ed8979b87eaf99702d5395d3e429adfc1ce87758200ef48567d2bdb990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10500 bytes

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