Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38442765766e7bc…

MALICIOUS

PDF

76.5 KB Created: 2021-03-30 01:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 498a3a482737c02a1d68c8eac9851c4b SHA-1: de547dacb795de63f5c64da132748ccb5b406b36 SHA-256: b38442765766e7bc72407b40f0db29c36c2e060d2e523e57126aefc257f43811
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bologen.ru/strik?utm_term=how+to+draw+what+you+see+rudy+de+reyna+review PDF link annotation
    • https://cdn.sqhk.co/vawapisoxe/fMSJ9gg/short_quotes_about_life_lessons_and_moving_on.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/fjaibjf/89830756139.pdfIn PDF document text
    • https://cdn.sqhk.co/riteximeras/jhcjdhf/gelamebagekabosubuv.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/ee670f3fd128c.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/2jdTYhf/hakuouki_characters_wiki.pdfIn PDF document text
    • https://jikizukudelo.weebly.com/uploads/1/3/4/8/134879768/mirat.pdfIn PDF document text
    • https://zolaverapudo.weebly.com/uploads/1/3/0/8/130874102/5302005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fd0bd1c9a4ab.pdfIn PDF document text
    • https://totimukax.weebly.com/uploads/1/3/0/7/130739837/wokomepanikezim.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/u7Mjjic/gazujixeva.pdfIn PDF document text
    • https://nopiviwefimak.weebly.com/uploads/1/3/4/7/134708781/fitizanig_dokopifulomem_nuwuxabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6045bbf140223.pdfIn PDF document text
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/kedafadozuf.pdfIn PDF document text
    • https://kevosenebiv.weebly.com/uploads/1/3/1/8/131871602/jakisi-kezamefelipob.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/miwezevokafa.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/vjggghj/cross_stitch_patterns_kingfisher.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/i8RijPs/monster_avatar_maker_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450513/normal_5fe5f9c2d8b73.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/7664608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fe17f5cb53e5.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/52ljf7y/44614120289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_6062498fb04b1.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/tezofuretejom/dinogefi.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/fuzobijuvofenofiri.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/wosubabujujaxidibet.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/lirojemovekazas.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/62857311385.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_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 5096 bytes
SHA-256: a0b77bc45135defd699e93331084d99f03aec81969989971470307783b40f95a
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 11408 bytes
SHA-256: 81a0a4e3f6ad6fd8df053e5284eb11757f68ef4c965c767ed8270abb4feefc39