Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdbb6d78122a8d7…

MALICIOUS

PDF

81.5 KB Created: 2021-03-29 02:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3915095794c3a79808293bc4caa19851 SHA-1: b177922630db253b4d7d4275f5faba638c3a37f6 SHA-256: 5bdbb6d78122a8d74e3ebd122b52f5316827d6eab271d772465edcef4083cb4b
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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 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://ponafet.ru/strik?utm_term=raymond+chandler+the+big+sleep+quotes PDF link annotation
    • https://xunilizavokuniz.weebly.com/uploads/1/3/6/0/136050149/soxodudi.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/7599524.pdfIn PDF document text
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/gedegetowup.pdfIn PDF document text
    • https://duverovimuvojap.weebly.com/uploads/1/3/4/1/134131352/wobemizosa.pdfIn PDF document text
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/kupudiwopumeri.pdfIn PDF document text
    • http://taxafig.66ghz.com/takoga.pdfIn PDF document text
    • https://pepexelizuruxu.weebly.com/uploads/1/3/4/6/134656498/f4248bc4598.pdfIn PDF document text
    • https://zexawowa.weebly.com/uploads/1/3/6/0/136081798/dugenusig-mabisob.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/association_rule_mining_models_and_algorithms.pdfIn PDF document text
    • https://tonogedufeji.weebly.com/uploads/1/3/4/3/134378200/vofijup.pdfIn PDF document text
    • http://sisefotazu.22web.org/gugezapezejagega.pdfIn PDF document text
    • https://wetuwene.weebly.com/uploads/1/3/5/4/135400298/gujid_lixezusenila_jelezugoku_jirosovefaj.pdfIn PDF document text
    • http://jogajep.medianewsonline.com/thoracic_back_exercises.pdfIn PDF document text
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/bevireme_zafododisijup_bajuvibajuja_litulagobega.pdfIn PDF document text
    • https://zenisitidijo.weebly.com/uploads/1/3/4/3/134309999/ferosu.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/90413fad14af01.pdfIn PDF document text
    • http://zemawage.22web.org/chicken_soup_for_the_soul_wet_dog_food_reviews.pdfIn PDF document text
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/3033625.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://sofidusujewa.epizy.com/93775873571.pdfIn PDF document text
    • http://galopaxuvubopuj.rf.gd/written_communication_skills_interview_questions_and_answers.pdfIn PDF document text
    • http://sexikiti.epizy.com/project_timeline_template_google_sheets.pdfIn PDF document text
    • http://feferabi.atwebpages.com/34912323081.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/87913413813.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/oxford_vocabulary_book.pdfIn PDF document text
    • http://disupenepoka.epizy.com/52660369096.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/cdf_and_explained.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_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 5744 bytes
SHA-256: d1b70c3f72f3ae7bc169d4709c8e590dbf3d326c111e34249490ea4ed87e02cf
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 10824 bytes
SHA-256: 4d7ebf7acd5b88be3396b7da7cc53aa3381cfdb6b6ac5e8b09c78d5efc122ace
font_02_sfnt_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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