Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b42102706e9edc3…

MALICIOUS

PDF

146.2 KB Created: 2021-06-11 04:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 03c1e23214066d01112285a97c33ffe4 SHA-1: afa34b01e13564cb0ada58ae9419939bda598658 SHA-256: 8b42102706e9edc37fdfff61f5993f7056ef83ae978d349e621e83a62ec67c73
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary URL observed is https://pixomot.ru/pbw?utm_term=pletnev+nutcracker+pdf, which is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/pbw?utm_term=pletnev+nutcracker+pdf PDF link annotation
    • https://ribosotegolexo.weebly.com/uploads/1/3/4/0/134013239/dc9bb2d7f8.pdfIn PDF document text
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/xafod.pdfIn PDF document text
    • https://bogemokized.weebly.com/uploads/1/3/4/3/134386998/6909764.pdfIn PDF document text
    • https://bofetolukolun.weebly.com/uploads/1/3/4/0/134018575/kemozazuw_lisajubut_gilavovevekib.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/fagidesujozig.pdfIn PDF document text
    • https://vimikipemaw.weebly.com/uploads/1/3/4/3/134331773/118da32ffea28aa.pdfIn PDF document text
    • https://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/luvewaminore.pdfIn PDF document text
    • https://jixulonirepib.weebly.com/uploads/1/3/1/3/131398443/2897673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144586341/5385548998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7b8d36-c08c-49bb-90fc-9b756f3ee504/pronoms_relatifs_qui_que_ou_exercices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed5317a-f5ce-4210-806d-435c0122d80d/kepobomob.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/pokmon_in_lets_go_pikachu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43deec28-dbf4-4f37-9982-1c53f666ce2a/27958529414.pdfIn PDF document text
    • http://sulegiwi.pbworks.com/f/cual_es_la_estructura_de_un_texto_narrativo_literario.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144453270/advantages_and_disadvantages_of_discounted_payback_period.pdfIn PDF document text
    • http://neruwuk.pbworks.com/f/jerupowo.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/xekab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d424d2e-3615-4f14-92a8-8d17a77eaf33/wazaruje.pdfIn PDF document text
    • http://pesivop.pbworks.com/f/78642266629.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144584232/5s_daily_checklist_examples.pdfIn PDF document text
    • http://guronavageba.pbworks.com/f/present_simple_vs_present_continuous_reading_comprehension_multiple_choice.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144423738/nagin_dance_nachna_mp3_song_download_bestwap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD85 5096 bytes
SHA-256: 9529fc3fa93e22a4772cf4843c514748464a0aa623cb7c84a2b5f59611a77038
font_01_sfnt_off0001eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEF5 18708 bytes
SHA-256: 8ebb0b4441e1091a8e11aa7c0f16e3685591dcb438b0a9b71da8a9dbd0915649
font_02_sfnt_off00022673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22673 16120 bytes
SHA-256: fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd

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