Malicious PDF — malware analysis report

Static analysis result for SHA-256 093cd4b2733cb92f…

MALICIOUS

PDF

81.2 KB Created: 2021-02-17 19:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0287a1088529f2761803f32b27a772eb SHA-1: d792f2bcb02bac3f04d500e7050d395b9895324a SHA-256: 093cd4b2733cb92f461c017901b9b4801009e118e5ecf8758bedb81b01454302
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external PDF links, with the primary suspicious URL being https://bologen.ru/. This suggests the document is part of a phishing or SEO spam campaign designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=how+large+is+a+male+brown+bears+hibernate PDF link annotation
    • https://momimuraw.weebly.com/uploads/1/3/1/3/131384495/nekid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_6018daf3471d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5feb4bdec3673.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/velarupodadelokojis.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/8856106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464865/normal_5fecbfdc377f5.pdfIn PDF document text
    • http://bit7.top/912609861815ipca.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/eTjfnih/ufc_254_khabib_vs_gaethje_full_fight.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/dozazuj-pexus-kowulidotofi-niroxixetigasik.pdfIn PDF document text
    • http://it50off.info/amaze_2017_reviewjwc8t.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/bMzJaih/romurigovejekitanokejaf.pdfIn PDF document text
    • http://org-fruit.space/5_8_drywall_sheet_home_depot32bcy.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
    • https://s3.amazonaws.com/gosete/aerobatics_performing_arts.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/17229833817.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/android_tv_box_can_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/food_safety_management_system.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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 5080 bytes
SHA-256: 5fca2771c84c9d1383727bd35f3cde6aecf2a70e305a7dc6407dccab29d2fdda
font_01_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 10476 bytes
SHA-256: 4731f46c84b5a69d56ba59ae45ede2b42b0318b1c33434ea6ba0c83a1b75cc89
font_02_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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