Malicious PDF — malware analysis report

Static analysis result for SHA-256 6706ff1b637b349c…

MALICIOUS

PDF

117.4 KB Created: 2021-03-22 08:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e488924ee49dfaa5a778046acfc4c14 SHA-1: 71915a4d29bba5fc3567f664b646f72cdaeb0b14 SHA-256: 6706ff1b637b349c9cedd19445907aac6dfd4007983beea803596ed80fe41496
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious sites. The primary malicious URL identified is https://xezojetit.ru/award?keyword=the+book+of+wisdom+in+the+bible+pdf, which is presented as a search result to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=the+book+of+wisdom+in+the+bible+pdf
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/duruxaxisel-vewarimezo.pdf
    • https://cdn-cms.f-static.net/uploads/4483071/normal_5fdb6286961af.pdf
    • https://jatomotubaw.weebly.com/uploads/1/3/0/7/130739460/9136406.pdf
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/3bdc8c549.pdf
    • https://cdn-cms.f-static.net/uploads/4474722/normal_60315b8b41778.pdf
    • https://komamopiragi.weebly.com/uploads/1/3/4/4/134444029/1251849.pdf
    • https://jadivamanug.weebly.com/uploads/1/3/4/8/134868371/3303847.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xefezesebusu/52403081961.pdf
    • http://vepejiwuj.rf.gd/66417778407.pdf
    • https://uploads.strikinglycdn.com/files/b86f9402-9f00-4097-8705-f323492691a6/3051175805.pdf
    • https://uploads.strikinglycdn.com/files/c27dddfa-9a30-4f17-972e-6dcef702073f/troy_bilt_weed_eater_leaf_blower_attachment.pdf
    • http://mewudupite.epizy.com/sufilamaxu.pdf
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_c883ab317316452c855cef3945a98649.pdf?index=true
    • http://rokodejufoda.rf.gd/suxamavibexarazad.pdf
    • http://vatifijagix.epizy.com/cctv_installation.pdf
    • https://uploads.strikinglycdn.com/files/d0473bcc-41b9-43b3-a0b4-0550ecaebe38/c_quick_reference_guides.pdf
    • https://uploads.strikinglycdn.com/files/6840bb3f-292f-4121-9f71-05369ba1368e/59651705249.pdf
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_67275bf8d9a64a0baae3556bf0f1bffc.pdf?index=true
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_c9386b569fa84e6aa4a3854bea3fb828.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e84e031-4467-4f15-a52b-98c89494adf0/99072533700.pdf
    • https://s3.amazonaws.com/novipaliwid/bureau_d_angle_informatique_ikea.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_off0001929d.bin
c111bb24093471c3cdeed2ff428e2a74ec6caff048049aa2828ad7d6176960bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1929D 5220 bytes
font_01_sfnt_off0001a44d.bin
981fcf342b1baa4a5da3b28a5ff062693b82518fdb7f75ec2de5dab01571e6d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A44D 10444 bytes

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