Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30950b123e09bf1…

MALICIOUS

PDF

78.4 KB Created: 2021-03-27 20:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 980b93c5ccb3161546927cac7040b9e6 SHA-1: e34c64a55c661c062eb58c2d101226ab30761d99 SHA-256: b30950b123e09bf118e0e0c72167e89e2b70073ef42fc2a6d46389703c231fd8
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. This suggests an attempt to manipulate search engine results or direct users to malicious content. While no scripts were explicitly extracted, the presence of numerous links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=android+apps+on+chromebook+2018
    • https://cdn-cms.f-static.net/uploads/4403414/normal_603776a8d7a77.pdf
    • https://cdn-cms.f-static.net/uploads/4404750/normal_601055fdda908.pdf
    • https://cdn-cms.f-static.net/uploads/4476783/normal_603ce655342d2.pdf
    • https://cdn.sqhk.co/subesanodag/1EdjjfQ/where_s_my_water_paid_apk_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4385876/normal_5fcaab2e3634b.pdf
    • https://cdn-cms.f-static.net/uploads/4502721/normal_60523848a0dd3.pdf
    • https://cdn.sqhk.co/xataruzepape/gfePRgh/ding_ding_dong_christmas_song.pdf
    • https://cdn.sqhk.co/mopewedote/iCjbPhj/vetunedazumasogasupisigit.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_6019d951e904b.pdf
    • https://static.s123-cdn-static.com/uploads/4408476/normal_5ff46d938c04b.pdf
    • https://static.s123-cdn-static.com/uploads/4455902/normal_6007a9aadc0e0.pdf
    • https://cdn-cms.f-static.net/uploads/4414849/normal_60594d9361650.pdf
    • https://cdn.sqhk.co/ralapogifur/IygjhhR/kajukedebojekesejasojete.pdf
    • https://cdn.sqhk.co/dikapagoloza/jDJ0Is1/online_multiplayer_rpg_games_no_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zobatokuvanoz.epizy.com/lafuxopugati.pdf
    • http://xelilurezo.epizy.com/free_asoka_songs.pdf
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_71031ef42bb94996812667fad5328b48.pdf?index=true
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_73fbc696331c4b07a3a2e23fb6883b01.pdf?index=true
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_d6fce11f372048518d121f5e023584d7.pdf?index=true
    • http://sujotoginejo.rf.gd/53867529850.pdf
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_a81b6b882b1c4f6789a88484057d4aa0.pdf?index=true
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_0f9adcc833844b96bb3bbaea39eabdd9.pdf?index=true
    • http://fuvezijejek.epizy.com/kadagatibiwiwesawofojab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f9.bin
dfed17d860f44594f22c0652c773f4e9edecccaa86f3390797c273c84cfc9a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 5996 bytes
font_01_sfnt_off0001072f.bin
58911022a113ab7a0551036241a40c5d1df206c7dec110a5a9f43fc532f653c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10756 bytes

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