Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98473828b47e85f…

MALICIOUS

PDF

89.7 KB Created: 2021-05-13 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8f3aa15be2b0b76d22f41461748db624 SHA-1: 00a07645338503c837c209476356c33c83d101fd SHA-256: f98473828b47e85f86ea9572997871581df3948c30afe35360abba8c72f27cc7
156 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing or malicious PDF, with a ML classifier output of 0.9989. It embeds external URIs, specifically pointing to 'https://jottigo.ru/strik?utm_term=how+to+change+battery+aimpoint+t1', which is likely a malicious landing page. The PDF also contains a link farm heuristic, suggesting it's part of a larger SEO manipulation scheme to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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.
  • 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://jottigo.ru/strik?utm_term=how+to+change+battery+aimpoint+t1 PDF link annotation
    • http://vovality.club/610840143817bhv9.pdfIn PDF document text
    • http://reduslim-sito.site/37897832297c5g64.pdfIn PDF document text
    • http://usacarins.com/wisixadoxufoxiwebunikavull09b4.pdfIn PDF document text
    • http://digitalmedialit.com/eau_urolithiasis_guidelines_2017ll27s.pdfIn PDF document text
    • http://4338bacchus.com/bavelijexegofose0kt0v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/jolly_phonics_actions_all_one_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/80781701148.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/allseasonsuniforms_promo_code.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_09b690facdcc44c5a54d16ebc86ab199.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_9e9508ec23f84cf0850dd47e7236db2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/all_in_one_desktop_best_value.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_5b429058a4eb4593a01e9e653fdb795d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/36501025369.pdfIn PDF document text
    • http://variwud.rf.gd/cnc_wire_bending_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/madadizodunu.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_906581d540784543b6dafc827b5fa82c.pdf?index=trueIn PDF document text
    • http://dizoleline.epizy.com/how_to_get_certified_as_a_veterinary_assistant.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/wajusokefadek.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/rusaderivukexaxajebelup.pdfIn PDF document text
    • http://navugudupeza.epizy.com/makalah_keberagaman_agama_di_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/piwifenupuzuguzeragemojol.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/yamas_and_niyamas_book.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/is_there_burger_king_in_california.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/55213677400.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001105a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 5272 bytes
SHA-256: 1bda793872f8ca23853fba0e16cef50990123dcf3979d918ceb46d9b0dc4a685
font_01_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 11692 bytes
SHA-256: 09b4b8cdf75413f1a1ceeae297a6b7e2066db951e3cd52d164025e68aae44995
font_02_sfnt_off0001499a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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