Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b19ba83e33c520…

MALICIOUS

PDF

80.4 KB Created: 2021-05-31 08:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8794731e2a1ef15e3080a95878836b13 SHA-1: 2519c058302b1dde2b4e2d4edc838450be8910e6 SHA-256: 52b19ba83e33c520dda08a941290b3d61b49319a742c961c0b6989b9540641c8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm, containing a large number of external links pointing to potentially malicious domains. The ML classifier and ClamAV also identified it as malicious. The presence of numerous links suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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=cladogram+worksheet+worm+spider+ant+and+fly PDF link annotation
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/8968f9.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/xijujawupov.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/kabolisafa_xuxuvazoravel.pdfIn PDF document text
    • https://kolabobinojojiv.weebly.com/uploads/1/3/4/8/134880551/kerojaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_6054d60eb47d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_602ba98a2f4b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_604df48d6a63d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426413/normal_5fde0be3a34fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417664/normal_60558f0c8d337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_605484289a85c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5ffeb4030f26e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_6019ca6195b03.pdfIn PDF document text
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/8f28fa4899.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/2718970.pdfIn PDF document text
    • https://xumotisububilup.weebly.com/uploads/1/3/4/5/134591263/71bc820e01c992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475995/normal_5fe43686e1fe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411696/normal_605dc8c654222.pdfIn PDF document text
    • https://zezuwosizu.weebly.com/uploads/1/3/4/4/134459619/risiramabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475016/normal_60148f143959f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5fca652fd5d3c.pdfIn PDF document text
    • https://mulibini.weebly.com/uploads/1/3/4/8/134881685/bazepidebobuve_xididepa_rosig_puxesom.pdfIn PDF document text
    • https://lozoliso.weebly.com/uploads/1/3/4/7/134775557/dc9bd0601648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4358ff9f-1b1b-49ec-a3b4-91f1ca5a9be2/92252536810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2b16fe-689b-407c-9552-5b3456acf140/xfer_serum_serial_number_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093f33be-3daf-47c0-98df-130f3c6fe4df/lg_washing_machine_repair_shop_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722e27c5-dd39-4702-8c84-7c73d2f0007b/gupaxokerasowewab.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_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 5620 bytes
SHA-256: 827207476a6968110456641ac5a28b808745d9473cdd075bebad1da9829ff197
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 11224 bytes
SHA-256: fcb5ad3fdd366109938def1570803cbe9a4acc1a6ce6c5d8082977069eadd5c0