Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f31b668d24306d9…

MALICIOUS

PDF

77.7 KB Created: 2021-05-19 02:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c928892800e9dbea76bd4e20b201529 SHA-1: 2026bb631454cf3baccea0a14f4d64971f3ff1bf SHA-256: 7f31b668d24306d97081798fb5fd00c6d005a3646624d748f71dc850494d699f
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many hosted on disposable domains, designed to create a link farm. The primary URL, 'https://botokaw.ru/strik?utm_term=tencent+gaming+buddy+latest+version+free+fire+download+for+pc', suggests a lure related to gaming software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=tencent+gaming+buddy+latest+version+free+fire+download+for+pc PDF link annotation
    • https://zuwanefo.weebly.com/uploads/1/3/4/0/134040462/varebiluk_gakig.pdfIn PDF document text
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/lotanima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_605a6944c0e70.pdfIn PDF document text
    • https://talesana.weebly.com/uploads/1/3/4/8/134878252/dutebodu-legaralewiradi.pdfIn PDF document text
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/9517440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_6036a5a0262a9.pdfIn PDF document text
    • https://sojenakituvewo.weebly.com/uploads/1/3/3/9/133986345/sadowag.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/zifomopegofesezu.pdfIn PDF document text
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/viveri.pdfIn PDF document text
    • https://xorodipilubila.weebly.com/uploads/1/3/5/3/135311864/2318830.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/4993345.pdfIn PDF document text
    • https://rolorizumi.weebly.com/uploads/1/3/4/3/134316308/rubimozi-pafebebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muvidunijusen.rf.gd/difference_between_cruise_missile_and_ballistic_missile.pdfIn PDF document text
    • http://nujafosedoke.epizy.com/gezon.pdfIn PDF document text
    • http://sarebabeb.epizy.com/jedunixalebabulojileg.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/what_is_the_wedding_tradition_of_jumping_over_a_broom.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/zunegeletoriwidabikopova.pdfIn PDF document text
    • http://nakulugexogi.rf.gd/83056890200.pdfIn PDF document text
    • http://babivukir.epizy.com/what_literature_class_is_easiest.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/oceanic_geo_2.0_dive_computer_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 5820 bytes
SHA-256: 130a0725a7fdd847292c56321e8f5538f51bccedef325edc66645f4ad7522c2a
font_01_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 10880 bytes
SHA-256: 3db15274b9c9a6b7f4eecb56889edbd250b90fd5a886072f2243c676b2fbf0f4