Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2d16084a37f4b5…

MALICIOUS

PDF

77.0 KB Created: 2021-05-04 08:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a261ef21799fc0e8b49fd5b45bbc28b SHA-1: 59acaf96c0aacfe25c9f515dd1f2638c15030855 SHA-256: 2d2d16084a37f4b5c2f595b121b7b449282a987a0db0b32ab31ec5a508b50f45
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external websites, suggesting a link farm or phishing attempt. The primary URL, 'https://jacksth.ru/strik?utm_term=how+to+apply+for+solo+parent+leave', is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://jacksth.ru/strik?utm_term=how+to+apply+for+solo+parent+leave
    • https://cdn.sqhk.co/wugoxoxowex/Vpkhbij/orange_granny_scary_horror_game_mod.pdf
    • https://cdn.sqhk.co/lilapanorup/gggfnmi/taxanagarewulenanidivosak.pdf
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/3805173bc9ef.pdf
    • https://cdn.sqhk.co/noxivudeva/lhcjxij/saneniximugunejupekiv.pdf
    • https://cdn-cms.f-static.net/uploads/4390056/normal_601c79253d382.pdf
    • https://cdn.sqhk.co/lulaxujik/cIx9dgi/joy_of_baking_chocolate_cake_ingredients.pdf
    • https://cdn.sqhk.co/giripiponi/iyrpysm/rapefudowana.pdf
    • https://cdn-cms.f-static.net/uploads/4458388/normal_600b8ff7b099f.pdf
    • https://rupijike.weebly.com/uploads/1/3/5/3/135312351/bc9dec8fedc.pdf
    • https://cdn-cms.f-static.net/uploads/4454575/normal_6057ad43e6d2a.pdf
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/zejovupe.pdf
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/kutetoxiworuwif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_940becee1e5f4684be6b04ff6ea94a95.pdf?index=true
    • https://s3.amazonaws.com/gosete/doneniwikudujexejewi.pdf
    • https://s3.amazonaws.com/varolexexus/77944992481.pdf
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_dbde21e41c164f388cde23beaf775264.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_a85d6444426c4854ba3aa541a9a8b46b.pdf?index=true
    • https://s3.amazonaws.com/pokorevalaxex/gajitenipudas.pdf
    • https://s3.amazonaws.com/vonusirukete/jemejumexikefafage.pdf
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_92d871dd038a4b8090649611b7719822.pdf?index=true
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_1e3729f604834c7ea7773d713b0f3e34.pdf?index=true
    • https://s3.amazonaws.com/jejulurowev/9012792316.pdf
    • https://s3.amazonaws.com/takebemanijewok/34601044873.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_off0000ef75.bin
7dea0a3ba9766f4e0d970d0fa7b5371d408be660421bafcd4bcb290c89777b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 5108 bytes
font_01_sfnt_off00010105.bin
7bf5201affac5b73c6d411c2b2747d4fba5928af1ec598150503e08421c42990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10976 bytes

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