Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8c1ab7d1f6bb1d…

MALICIOUS

PDF

72.1 KB Created: 2021-04-01 11:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1dc2681c69d6e6f06b4f07802a754dd4 SHA-1: e8d160964e8802ed3745f3d5129c3bbc97b8dc8d SHA-256: eb8c1ab7d1f6bb1d854089e02d50ee7ec91782b2c61ad07251638752c5af4906
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of external URIs, specifically the one pointing to 'botokaw.ru', suggests a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users by redirecting them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=focusrite+scarlett+2i2+studio+%25282nd+gen%2529+usb+audio+interface+and+recording+bundle PDF link annotation
    • https://zeloseko.weebly.com/uploads/1/3/1/1/131163733/lijavumutik.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/7661552.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/ketogenic_diet_for_beginners.pdfIn PDF document text
    • https://nilizexuv.weebly.com/uploads/1/3/0/7/130739046/rorefaku.pdfIn PDF document text
    • http://satomupudogoni.22web.org/nijinukofununema.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/ischemic_heart_disease_treatment.pdfIn PDF document text
    • https://ronukava.weebly.com/uploads/1/3/4/8/134885886/6294250.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/acute_and_chronic_heart_failure_pocket_guidelines.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/1499686.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/augustan_age_18th_century_literature.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/berio_sinfonia_score.pdfIn PDF document text
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/4101388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wutogugej/arduino_nano_tutorial_for_beginners.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/adjetivos_comparativos_en_ingles_lista.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/86940460668.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/28424191017.pdfIn PDF document text
    • http://wekujugom.epizy.com/21973053480.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/maplestory_mobile_mesos_guide.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 5452 bytes
SHA-256: 4e4c267cb4c49d8f822869a40b6fd091a72188e42305d11cdc26ffaa17ef8ed5
font_01_sfnt_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 10592 bytes
SHA-256: d5a32e6f40c62f68a687f0450f67709b0166c776eefad85de015d78a2fdaa589
font_02_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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