Malicious PDF — malware analysis report

Static analysis result for SHA-256 6632a60d89402bf4…

MALICIOUS

PDF

85.7 KB Created: 2021-03-17 08:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 648f18c920281a23e2e710b25197c6b6 SHA-1: 152cfd59718cb670647448205cd3f7b4e5d6ff65 SHA-256: 6632a60d89402bf47a29340c27b02c401c94e80c411bfc55a3c648f7803fd5b2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to redirect users. The primary external URL observed is https://kuzutuzo.ru/award?keyword=aperture+and+shutter+speed+chart+pdf, which is likely part of the malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=aperture+and+shutter+speed+chart+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491665/normal_5fe28feb26af4.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/a2cc860bf55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_604943c1178e7.pdfIn PDF document text
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/dogirefizipuruvama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417429/normal_5fd8b4242ce7b.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/4924000.pdfIn PDF document text
    • https://papilezuserif.weebly.com/uploads/1/3/4/4/134437149/8561468fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_600d9bba7992d.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/fiLuat7/9151117613.pdfIn PDF document text
    • https://cdn.sqhk.co/sufiwotag/jjLh75t/12838056767.pdfIn PDF document text
    • https://cdn.sqhk.co/wavafinudow/jiIjbn3/dungeon_keeper_2_cheats_temple.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://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_dd1b8991357940c1bc8f1f9d5268b4a8.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_db06cd1deb5240faa9794c91fcdf092a.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_4a4765ffbe3c43f9b641dad7862d22bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e11a091-b225-43dd-b131-38995bee3bdb/what_are_low_calorie_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fdf6bf-c9b8-4474-84bd-de0186bf1ead/pagexidu.pdfIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_ad310c4f86604772983fd605c9270f61.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_484141e9a9e245a7a09512c3fd1ec2cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d19ac2-e5df-4d6f-b60f-82013bf59808/jepokululumokiravi.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_8fb53503e0c1468d94e5caea2ad39802.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_963022825f454afb816075f1a7a5f4f3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 4924 bytes
SHA-256: b98dd892d07c303e3b0e748972d29fdd709ebd2568a8abf66bd0b9a39d84cb30
font_01_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 10684 bytes
SHA-256: 2ac8218003422736b2154748725c436010fe3ca4743e17f183da3cbc33da2241
font_02_sfnt_off000139c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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