Malicious PDF — malware analysis report

Static analysis result for SHA-256 818584ba0aa6da76…

MALICIOUS

PDF

81.3 KB Created: 2021-03-17 16:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ffe579b7e3f9a047e5fb7242b310930 SHA-1: 84962a4a8d8512ea0ed9dccbb6d97c2238f789ac SHA-256: 818584ba0aa6da76a59bb5789a373dad9acb8012951c8331905440c590643443
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 disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains references to 'fishbone diagram templates word' and the wkhtmltopdf tool, suggesting a lure to a link farm. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/123?utm_term=fishbone+diagram+templates+word
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5fcc71551e002.pdf
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/witemofibopelurilavu.pdf
    • https://cdn.sqhk.co/loboremetoxe/fjjnBNU/96351390377.pdf
    • https://cdn.sqhk.co/zeburozupax/hbwghig/juwijijeva.pdf
    • https://cdn-cms.f-static.net/uploads/4531626/normal_601160d1760d1.pdf
    • https://noloxuxema.weebly.com/uploads/1/3/1/4/131453633/muwojemoja.pdf
    • https://cdn.sqhk.co/bebetirifam/eLlbhin/tizijiroma.pdf
    • https://static.s123-cdn-static.com/uploads/4389792/normal_5fcbe3e51ffa5.pdf
    • http://fidisop.22web.org/walmart_tv_black_friday_deals_2019.pdf
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/lakiwuruwemosep.pdf
    • https://cdn.sqhk.co/sovokeduseb/dje9V5c/rizufowepifakibiwidawulag.pdf
    • https://cdn.sqhk.co/vetelojid/fjS4ARu/5724416988.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_53595c55144a4dfcb77fcdb9830430e8.pdf?index=true
    • https://s3.amazonaws.com/xokebore/types_of_allen_bolts.pdf
    • https://s3.amazonaws.com/gotitibekovi/marco_reus_injury_report.pdf
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_9627bdaa4885463893ba01a640312aae.pdf?index=true
    • http://jojerigexorow.epizy.com/essential_actionscript_3._0.pdf
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_150db614f8fb49debd646543b49f34ac.pdf?index=true
    • https://s3.amazonaws.com/visagogijulep/jajopeno.pdf
    • http://totiwofosu.epizy.com/catonsville_weather_report.pdf
    • http://pigonewapipuvib.rf.gd/academic_writing_jobs_in_kenya_2021.pdf
    • https://s3.amazonaws.com/zoluwivebiro/zosowelereto.pdf
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_4eace9d3fe0e4091b684bf1aeedd987b.pdf?index=true
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_b68c6b56db4a41e888c17d50778cc70a.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_off0000f6ba.bin
815c5899be20c956183431bf0868252fe03e950d44047e10faf10c07339057a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 5560 bytes
font_01_sfnt_off0001097d.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 1800 bytes
font_02_sfnt_off0001120b.bin
896caf0d451bd6a54197ca05be1090180e25ebb7abefb73cf58f05a38c5304b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 10960 bytes