Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd802a94cb4991b…

MALICIOUS

PDF

78.3 KB Created: 2021-03-01 09:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3756466dd82f14bb24fb15005375d112 SHA-1: 411fd99ce2ab4786533ba80cbcd187db80b60cbf SHA-256: 2dd802a94cb4991b28e54029d98ee2389186b67ed4c852d5535a72408fd0c405
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links pointing to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://dugedepap.ru/strik?utm_term=how+to+turn+on+an+echo+leaf+blower', indicates a potential lure related to search engine optimization or content 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://dugedepap.ru/strik?utm_term=how+to+turn+on+an+echo+leaf+blower PDF link annotation
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/84692d9eadd30.pdfIn PDF document text
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/fipesusopawaxim.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/3275945.pdfIn PDF document text
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/3247338.pdfIn PDF document text
    • https://gapetomoje.weebly.com/uploads/1/3/2/8/132816106/778873.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/jomopeju.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/jezixodemirajayka1.pdfIn PDF document text
    • http://romeita.fun/meaning_formative_assessment_definitiontk58c.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/fojufapafut.pdfIn PDF document text
    • https://pabovojusu.weebly.com/uploads/1/3/4/3/134339388/jawuvaserimevas_tijodosomut_besejunegore.pdfIn PDF document text
    • https://vakilelem.weebly.com/uploads/1/3/1/3/131379598/6134485.pdfIn PDF document text
    • http://rometinanuk.iblogger.org/division_problems_with_answers.pdfIn PDF document text
    • http://leledup.mypressonline.com/10698969402.pdfIn PDF document text
    • http://mkr-olimp.info/mesillas_yesharimjsyyr.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
    • http://dizutobasuxolom.epizy.com/i_love_you_janu_beautiful_song.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_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 4820 bytes
SHA-256: b6a43d999a749377bdaa294d50885d60a4393c6d19b0d241a74d56eea472ed8a
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10756 bytes
SHA-256: 3994b062042718a0fc96ed959abba04d70e90b0bbaba04058afaec70a8c40b74
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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