Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a77060e17318bf…

MALICIOUS

PDF

73.7 KB Created: 2021-03-14 10:26:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ced32b67c3536be88f6d51eca97e3892 SHA-1: 513e580501dfdca5497b2e5c77a811b192eddd6c SHA-256: 51a77060e17318bf0ba7d4a61d81afce7f52e7a76387d9bab9d21635cd735fdd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=august+month+current+affairs+2020+pdf+adda PDF link annotation
    • http://cartest.pro/pulediguxinitefemagormjob.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/gcIhfia/xopajomezupaleroketixanen.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/dgdhjgg/95774830537.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/uPihgrJ/solar_smash_free_apk.pdfIn PDF document text
    • http://nesobaka7.xyz/water_slide_jumper_rental7y4q0.pdfIn PDF document text
    • http://mosaniz.22web.org/zodidijekosav.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/gful8rX/t_34_85_wot.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/krjihdL/15905819268.pdfIn PDF document text
    • https://cdn.sqhk.co/gobamagedesi/L8A0fge/instrumental_rap_trap_2019_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/dkv480d/gigabit_off_road_apk_money.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/ghi3J1J/78981617728.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/jhifhcn/clownfish_voice_changer_xbox_app.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/Y0qibhc/zenekupusutejedakigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_7f78a64c3e694a8d9972d9f88a9b2930.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_11db3b5ddc8b46a9acf96191238b99ca.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_218de7f6ffa84d709f873de720eee7e5.pdf?index=trueIn PDF document text
    • http://xufivutuxalug.rf.gd/aastha_gill_images.pdfIn PDF document text
    • http://fugebuxojawuris.epizy.com/software_issue_tracker_excel_template.pdfIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_80acfb050b624c09b268af07b4f42c32.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_d4abb87855e7484780e907a17d00500b.pdf?index=trueIn PDF document text
    • http://kalotiwinilobiw.epizy.com/chava_book_free.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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 5800 bytes
SHA-256: a403890df0161973cc4ecacae49523998e63bb1a8104654e22a03ad3e650d244
font_01_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 10948 bytes
SHA-256: dbd82cf05252f57080e8d31280421ac26843480c55f898c612c2d3fcfe2b9e7a

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