Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0350dc714cb81f1…

MALICIOUS

PDF

80.2 KB Created: 2021-04-08 04:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 263ff18346cfd390df90792d78f86ea5 SHA-1: e62dfc77fc039b4ced76cfeb27311d629ebfc1d3 SHA-256: f0350dc714cb81f1ba0d6a374e595cec39e00c4b3cd6acc56af4fb7fc8542b0b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to redirect users to phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the document's structure and link farm behavior are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=gwadar+free+zone+investment+guideline+published
    • https://merasewutid.weebly.com/uploads/1/3/4/3/134348660/11b02792f896.pdf
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/pozuvixikogor.pdf
    • http://zotokes.iblogger.org/oxford_dictionary_app_download_english_to_urdu.pdf
    • http://sreview.online/me_myself_and_lies_videoskd30e.pdf
    • http://dkmz3.club/stylish_academic_writingekh4k.pdf
    • https://fuvutefimege.weebly.com/uploads/1/3/1/4/131453053/raxuratelizudazu.pdf
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/7071239.pdf
    • http://good-production16.site/shoei_neotec_2_helmet_lock6sclo.pdf
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/voguxo_fetigujimerade.pdf
    • http://lishop.site/tavasuteso7jops.pdf
    • http://lnstagram-verificationbadgeform.com/kovepefwy9n.pdf
    • http://ita-bio.fun/commercial_beer_fridge_for_saleo3dch.pdf
    • http://copyrightshelpscenters.com/gesugatadepikh16t.pdf
    • http://es50off.pro/recording_the_beatles_downloadnpbs3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc339b61-b873-4a22-bec3-714970213511/44379465104.pdf
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_956c90539e6b49b598f368892c4c207b.pdf?index=true
    • http://gowamatul.epizy.com/phantom_bengali_comics_free_download.pdf
    • http://zaxesagujudiwa.epizy.com/how_to_get_unlimited_money_in_gta_5_online_ps4_2020.pdf
    • https://uploads.strikinglycdn.com/files/a953ee4b-a464-41e9-8aa0-05dae1eb350b/95549346479.pdf
    • http://danofawo.rf.gd/how_many_calories_are_in_a_arbys_fish_sandwich.pdf
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_2d68a4cd146d4adf9024956a1b3a5e9c.pdf?index=true
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_9f01e4e82f1c443484548120be7d6cd1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8454c752-e9d3-4f2a-bbc5-448d5445d56c/what_do_double_numbers_mean_spiritually.pdf
    • http://vanepozimor.rf.gd/76222454375.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_off0000f918.bin
baa727b22bcf8cf80c1df2d83ab2ef7d4e1456e230892a9cb1cf7e850b9ac777		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 5828 bytes
font_01_sfnt_off00010ce5.bin
e9b616956c16f15ddece689c8c73fa052b2709e611730f328a2e6574b0493a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 11108 bytes

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