Malicious PDF — malware analysis report

Static analysis result for SHA-256 8888266afa5c1369…

MALICIOUS

PDF

83.4 KB Created: 2021-01-18 12:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fc0722fb13448852cf2c25836f0d2640 SHA-1: 72bba44f94b924f4faf6c28881bf8f2b2c3502ca SHA-256: 8888266afa5c136945f3eba836396cc7d435eabdbb42909cce634c6f2362ba01
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to 'slideshow powerpoint template free' and 'wkhtmltopdf', indicating a lure to a website that likely hosts further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=slideshow+powerpoint+template+free PDF link annotation
    • https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/dunasu-bazusojovaje.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/ighgjhi/stress_management_workshop_activities.pdfIn PDF document text
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/343815.pdfIn PDF document text
    • http://belixawotid.66ghz.com/assistive_media.pdfIn PDF document text
    • https://zuzumesagodufen.weebly.com/uploads/1/3/2/6/132695194/sogalisebabevo_zebuzokatinege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_5fad74f4dd08d.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/jopum-wusuj-todoparowak-mazulorajadaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f88a2ee6524b.pdfIn PDF document text
    • https://mufiwejugoj.weebly.com/uploads/1/3/4/3/134340856/8514633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5ff340cb95714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469349/normal_600361a24bd4f.pdfIn PDF document text
    • https://cdn.sqhk.co/zawitagevute/cjejNhb/pes_club_manager_cheat_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5f9ae7976a585.pdfIn PDF document text
    • https://wuvozova.weebly.com/uploads/1/3/4/5/134500004/mukizumanuxoxun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5ff0a5215db24.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/habgiaA/95902276775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 5476 bytes
SHA-256: 3998361c2c969d18b3f1d25e8dc4a3a417b991becf60c3f15f33a530b90475b2
font_01_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 10516 bytes
SHA-256: ff99ecce8be89c5ad44035a69a56f544b328fc11b21194b8f6e39aa6f4bff61e

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