Malicious PDF — malware analysis report

Static analysis result for SHA-256 d361d597c443fd9a…

MALICIOUS

PDF

89.6 KB Created: 2021-03-04 07:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f6e6dcc1259cb626cb3adc132b8458bf SHA-1: f15bccf454b5f2337a8b737d96266209d13f528c SHA-256: d361d597c443fd9a0fc642a2d44f77f7437ee62d52b2c4ed1bdb4692fa9d559a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains and Weebly, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs suggests an attempt to direct users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the structure and heuristic firings point to a malicious intent related to content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://seumenha.ru/123?utm_term=tecsun+pl+660+manuale+italiano PDF link annotation
    • http://vandify.com/how_to_fix_corrupted_data_on_ps4_pro208mg.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/aifehhj/74718445927.pdfIn PDF document text
    • https://wurudejokifar.weebly.com/uploads/1/3/0/7/130776262/9058122.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/pakebunane-wilab.pdfIn PDF document text
    • https://gudimutukadido.weebly.com/uploads/1/3/4/6/134648046/5913165.pdfIn PDF document text
    • https://cdn.sqhk.co/babonisu/hih33Uz/runecrafting_guide_rs3_f2p.pdfIn PDF document text
    • https://guvatezip.weebly.com/uploads/1/3/0/7/130776756/bidedu.pdfIn PDF document text
    • https://cdn.sqhk.co/juvexafi/jjgfjhz/bijudapidivukivaxuv.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/haxjahg/adidas_ultra_boost_19_star_wars_millennium_falcon.pdfIn PDF document text
    • http://m-laskin.ru/vepusaruxaxudivafogediji3l6j2.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/gdo24P0/radiant_church_richland_times.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/gotenukevepunin/wedding_couple_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/zexevumelubapaton.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_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 5108 bytes
SHA-256: bc0155018e755d928d4ee918231a3acf8c75773fa649df8f26d3647569b15f56
font_01_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 11344 bytes
SHA-256: 96edc3fd751598356b134f4175640d15d93ac2c2e1e0827777a44564487722fd
font_02_sfnt_off00014b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B50 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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