Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf30f46e2ae008ef…

MALICIOUS

PDF

86.0 KB Created: 2021-03-13 21:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0702d7a69f3e7cd4b68a75e935e4144d SHA-1: 8ebff599e7096074bdaf89bd949cf4498c8f3f71 SHA-256: bf30f46e2ae008ef2751b404a7147788bd229760ee265088b8ac2c85ea4a30ac
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to potentially harmful sites. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=muscle+size+5x5+workout+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378619/normal_600d6aaecfb90.pdfIn PDF document text
    • https://cdn.sqhk.co/wowasuperan/3NwfjbA/5380521676.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/narob_nalisudoxez_gafitoxij_komika.pdfIn PDF document text
    • https://cdn.sqhk.co/vutabopi/fmdnxjc/10312150570.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/BYierja/grand_crime_gangster_mod_apk_unlimited_money_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495694/normal_6047ac14c0c13.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/975e48a.pdfIn PDF document text
    • https://soruxepamoni.weebly.com/uploads/1/3/5/9/135992355/pojunagolami_ronawom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_604912835cee2.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/ehaijBH/16101170017.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/1hjvcii/3d_heart_glasses_bulk.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/vagekufebon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5fe356b52a6d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405895/normal_5fdf06149a039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/5th_grade_math_equations_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/meu_like_us_apk.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_53cf89abeb784095a49e269fa450c70d.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_4b626175cad148929e17e01badc48249.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_8d8cae7b69d6419d8684d89cabf13f1f.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_7d7cb20ec0624579b16776697824a1c7.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_e6682c0cee9844ff9867bb4ea5a0f568.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_1d604db765844c908b5749bed7bf0f94.pdf?index=trueIn 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_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 5344 bytes
SHA-256: 7eb7834cbc6344531d9b45db1e381a74fbeccf47aded04b8fa95411997d5efef
font_01_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 11116 bytes
SHA-256: 0deb98f1a4767d7661a392079e93a9662a7afd0c17505cba4cfde686dcc6e410