Malicious PDF — malware analysis report

Static analysis result for SHA-256 e063a4406db1ec91…

MALICIOUS

PDF

80.3 KB Created: 2021-05-18 10:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff54250315480b7cb15158e357051828 SHA-1: 50d049f86437d314498a3e7f9f94d4cbbbda64fe SHA-256: e063a4406db1ec911a56e80d9aaa8668ceb78b935e1a438e672dc9afdf23cc2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm for SEO manipulation or phishing. The primary malicious URL, 'https://ponafet.ru/strik?utm_term=pokemon+ruby+extreme+randomizer+gba+download', is presented as a download link for a game, a common lure. ClamAV and ML heuristics confirm the malicious nature of the document, flagging it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/strik?utm_term=pokemon+ruby+extreme+randomizer+gba+download
    • https://cdn-cms.f-static.net/uploads/4445726/normal_603e175895cf5.pdf
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/bemizemip_wesuzagorokuv_valanaromolir_siretu.pdf
    • https://static.s123-cdn-static.com/uploads/4483071/normal_6008ef5623ec2.pdf
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5ff4d08245431.pdf
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fed5ac0d6ec5.pdf
    • https://cdn-cms.f-static.net/uploads/4375521/normal_601461fe32cce.pdf
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6018d03eebfc9.pdf
    • https://susotavawo.weebly.com/uploads/1/3/5/3/135325365/pesajexivup_rujodapigugokil.pdf
    • https://cdn-cms.f-static.net/uploads/4463808/normal_60603a94dfede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vabedafozo/dsssb_grade_4_answer_key_2_17.pdf
    • https://s3.amazonaws.com/pipaneku/firefox_app_location.pdf
    • http://nematamaduwos.epizy.com/calculus_single_variable_7th_edition_solutions.pdf
    • https://s3.amazonaws.com/tufitijinexu/nuvavuf.pdf
    • http://fazafof.rf.gd/wovalibub.pdf
    • http://xadeboni.epizy.com/kagemipizuxixagagaz.pdf
    • https://s3.amazonaws.com/fizup/rinnai_r85_installation_manual.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/cuisinart_cbk-110_compact_automatic_bread_maker_reviews.pdf
    • https://s3.amazonaws.com/mexavofezoxi/jutifusosexidujurovuse.pdf
    • https://s3.amazonaws.com/lebejos/2943406539.pdf
    • https://s3.amazonaws.com/nilafafakem/boundary_lakes_course_guide.pdf
    • https://s3.amazonaws.com/fokapikow/75511299076.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e8.bin
b1ce74660c019f83f291e665de109c49ef59747cc616f4e02c9d07c5bffaaa06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 5484 bytes
font_01_sfnt_off00010ba3.bin
b0458cf6e52b42baf7380be1c7bdb923f8d36453dd4d8f2e65430c972f94d85b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 12632 bytes

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