Malicious PDF — malware analysis report

Static analysis result for SHA-256 55598e766e7cedef…

MALICIOUS

PDF

74.4 KB Created: 2021-03-28 23:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0b2cf1053ad1c67bce59108ecc428af7 SHA-1: 0ca6c7ac9e8d8b4a657d0520820de83306ebcf46 SHA-256: 55598e766e7cedef865263063d722db16565cff2413c1b98a48546845a16c3b2
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=cp+geometry+midterm+review+packet+answers PDF link annotation
    • https://cdn.sqhk.co/lodikorep/Tr4jjVX/grand_theft_auto_vice_city_ps4_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/glSidgc/80476277120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_60274c4e5db11.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/Hgjggxp/12_string_electric_guitar_for_sale_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/ripowusaro/diijfOS/3529246805.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/3gdihba/natujusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_604f295a56535.pdfIn PDF document text
    • https://cdn.sqhk.co/wazotifuk/dNjgoha/30261976454.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/yDicniB/international_business_lawyer_salary_uk.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/acceptable_use_policy.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/J6vih3p/fantasy_kingdom_defense.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_78aa1fbb1226420b852a11ab0ecf5d41.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_08e43e849420416c8f975bf6934daf19.pdf?index=trueIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_7801b5cd450e4ec0a2abf6fc1befdace.pdf?index=trueIn PDF document text
    • https://81d89a68-18ac-4cf1-ad00-ddd5d2f7da41.filesusr.com/ugd/ed58ef_2d01c446f38143c49e1eb37b18505e1a.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_6a653324ed0c40a680a8697844deec9d.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_e54ce116850f47e1b6f8c2e83c1006b6.pdf?index=trueIn PDF document text
    • http://fabonejane.onlinewebshop.net/palasalezolatoz.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_453946bffa8b4f4fa691b06ea95eeaca.pdf?index=trueIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_634206cba2a5421fb1832f903a8770c1.pdf?index=trueIn 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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 5584 bytes
SHA-256: 4638691b50b50d9b8fffde2f7e588671dbae4b27b3c17e61964c2bad06361a2e
font_01_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 11132 bytes
SHA-256: 2e6bb1bbf42d31942d9b383ca453c70a4fe0a5c708db459f762309e0693d06a4