Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d0d1d312382ac3…

MALICIOUS

PDF

78.3 KB Created: 2021-03-31 16:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46e4d9f8694340f2f091fd6a60b135cf SHA-1: 7424b4421f5aabe4bd536fb94b4ae3b9383cc594 SHA-256: 55d0d1d312382ac37525fa4435c5e990c1b728ec99c033e257ebce3ffc3eac41
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=avaya+partner+18d+not+ringing
    • http://tiriruno.sportsontheweb.net/business_english_vocabulary_in_use.pdf
    • http://nosatines.mypressonline.com/46052880404.pdf
    • http://nejevefivi.mypressonline.com/buzokiva.pdf
    • http://dapajurop.mygamesonline.org/how_to_change_font_size_on_brady_tls2200.pdf
    • http://fizebiredasibi.mypressonline.com/89169536036.pdf
    • https://cdn-cms.f-static.net/uploads/4454171/normal_6062592e8ea06.pdf
    • https://cdn-cms.f-static.net/uploads/4467030/normal_60268cef190c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_d1136f44691a4dd8bebfc0d9365dc6da.pdf?index=true
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_2da1f4d88fa247ad850cfdde03b03a6f.pdf?index=true
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_f756199d89e84a4e95c3ca08fcf5decf.pdf?index=true
    • http://gevejonitu.onlinewebshop.net/zimsec_a_level_mathematics_syllabus_2020.pdf
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_acaa3477bd084370b951a5785d273735.pdf?index=true
    • https://s3.amazonaws.com/dagasopones/xufokobimilapop.pdf
    • https://s3.amazonaws.com/nowokil/26446712416.pdf
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_c5c279463ca541f181f9bfee165e370a.pdf?index=true
    • https://s3.amazonaws.com/sirilagewuga/xerox_workcentre_7835i_waste_toner.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_a048a6fc1a854a8493fbda7dfc5b077c.pdf?index=true
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_085c1553ec8b4d5f901fa9be5b82297f.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_6eb47217fa06450a98e7e9b623af0ebd.pdf?index=true
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_d7479d4ca3764898a82e92b7e297b7fe.pdf?index=true
    • https://s3.amazonaws.com/jidagafinuxesu/ditak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b7.bin
44e0d5a9adef27fcc5b8aad40e0748c61a2a881a24e5c340836a1b8d0b375ebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 5100 bytes
font_01_sfnt_off0000f72b.bin
f97909ea253f1203f09605d6c05ffc642564833340d53ca1a7cdeaf1686a70ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 11300 bytes
font_02_sfnt_off00011dc2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 4324 bytes

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