Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce765b10d725ce52…

MALICIOUS

PDF

79.9 KB Created: 2021-02-03 13:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d9589c9c5ec2300d2b46f58bcbddf9db SHA-1: 6ce229e0e53a16a042fd87d83e118a29aa958ae8 SHA-256: ce765b10d725ce52efe2f60e70fdd5678f2402efa69ec0a3414d662bbffd6049
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm likely used for SEO manipulation or to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent. The embedded URLs, such as 'https://yafferge.ru/wb?keyword=dental%20abscess%20management%20guidelines', are likely part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=dental%20abscess%20management%20guidelines In PDF document text
    • https://cdn.sqhk.co/xurazegoba/Iicgejf/infinite_painter_download_brushes.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/icifiej/pixel_car_racer_pc_mod.pdfIn PDF document text
    • http://veloxezidirexob.iblogger.org/rezowemedogenozeri.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/vaxejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_5fd3a779ea638.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/8a83c3e13.pdfIn PDF document text
    • http://kukushka.space/pejadomafeluxiselubksy0.pdfIn PDF document text
    • https://cdn.sqhk.co/vikafaselida/jjdChew/fobazaxubeduwusirubopaj.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/BJtgeib/smoothie_makers_reviews_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/iKvMWie/20222455343.pdfIn PDF document text
    • https://punuvenow.weebly.com/uploads/1/3/4/4/134445800/xobumesarewafufuxewi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pufaperimixalet.epizy.com/gewukafozuf.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/academic_performance_defined_by_authors.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/sheets_api_valueinputoption.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/easy_worship_video_loops_free.pdfIn PDF document text
    • http://sonevovavar.rf.gd/audiosurf_free_pc.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_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 5304 bytes
SHA-256: 9e90626d6faa868d587640165976efad097e1dcf1b9a05a73d01220a4be5901b
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 10684 bytes
SHA-256: 52dc15a7925b7a490192e038d9f000797d9980ad53c775cf7bf605d2e0c7f150

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