Malicious PDF — malware analysis report

Static analysis result for SHA-256 748eb68fb2c00687…

MALICIOUS

PDF

78.8 KB Created: 2021-04-18 12:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c6c59e922c16d6300122f06788879e8d SHA-1: 5abceeec125b4d91fd30943f982edc4346e1fb60 SHA-256: 748eb68fb2c0068796426b37b11cf3dcbf84c2c5be3c3f7e8b42b59267e2ceb9
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO manipulation tactic. The primary URL, 'https://lozipotod.ru/strik?utm_term=how+to+jump+rope+beginners', suggests a lure for users searching for beginner jump rope techniques. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=how+to+jump+rope+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453907/normal_602882bb47d5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_60023c444eb1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_6056d423dd0d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_601562528677f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_60186baf62440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_aa7f8008406f40b99782afebc8ea1a0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00bae385-b5aa-48cf-ad61-797b7654c372/hoover_windtunnel_air_lift_upright_vacuum_reviews.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_1670c1fd2cdb41c88a194f02bf9151cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64474814-1401-4dc6-ac23-f55f2f362065/replace_power_vent_water_heater_with_tankless.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/harkness_discussion_template.pdfIn PDF document text
    • http://dotimazuf.rf.gd/whirlpool_cabrio_platinum_washer_not_turning_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edead24-e4b4-48d0-a516-3f783889720c/dokibowupufibivupare.pdfIn PDF document text
    • http://teditobu.rf.gd/28669969739.pdfIn PDF document text
    • http://deroselewem.epizy.com/bombay_high_court_nagpur_bench_cause_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053a8801-3206-4069-bd74-313ee168d7d5/cognitive_behavioral_therapy_for_dummies_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8bd8bb-db80-4bb8-aadc-b194932261bf/nexikasarif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae7fce0-b741-4aa5-af04-dd6f8176c6c9/covalent_bonding_practice_problems_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce40bff1-6a60-445e-8661-481f2ece4653/vadozatudukozekodekit.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_76a25c6e51384636bc657648f4ed8cc4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefodek/88286545728.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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 5168 bytes
SHA-256: 3107b62ab9820664cca2f1a0af022a4bd4a71a80ae490031eabadcd6d30a650d
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 10876 bytes
SHA-256: 35a12de9d0cc777e3d0ff4b59c5e749530cb9ee6e3144d1d741aefb9dd75bc8f