Malicious PDF — malware analysis report

Static analysis result for SHA-256 a428185d19718003…

MALICIOUS

PDF

80.2 KB Created: 2021-04-22 22:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d0742ea8b3828f91aeeef55e6b33ad53 SHA-1: 7f36551c84e56cee4d7777a995c913dd720b3a89 SHA-256: a428185d19718003779bf22b70881ac1acbce7a4ef2cf866abb1ff1f28a820b2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, and a primary URL designed to lure users with a seemingly innocuous topic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/strik?utm_term=how+to+change+oil+in+sears+lawn+tractor PDF link annotation
    • http://fagumawegoleleb.mypressonline.com/65509047497.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/xufemavoduxor.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/xebofumipatib.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/the_boy_in_the_striped_pyjamas_review_film.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://uploads.strikinglycdn.com/files/1bcb7ce2-defb-43af-bdae-3fd37f1633e7/dototedusaxovuwidajolu.pdfIn PDF document text
    • http://vabanenutulaki.rf.gd/cambios_fisiologicos_y_psicologicos_durante_el_embarazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e21617-3774-43e2-b05c-e935bc963f6b/91270123305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0b96f7-3533-471e-a957-fa394065ef5e/the_leftovers_plot_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/sofofotinumivabikevozag.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/65209262897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7967f09-5ade-472d-8a78-a3669773fea4/51743623438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9a80bb-2c01-4c11-b5a5-e3cc88e7f115/42249766730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f34404-8eff-409c-aa01-448fc46e4107/unix_permissions_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8d0a7a-aefa-42eb-a827-e14668021039/67881478112.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/charting_oxidation_number_worksheet_answers.pdfIn PDF document text
    • http://godikopikigelug.epizy.com/86205302638.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_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 4904 bytes
SHA-256: de145508c692c2d7a979f586f8e2fa0325e9acf670e8a1d2c535268d0955ee14
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 10332 bytes
SHA-256: 89c42ee37c6c4b96abd24feb8ac65ff11a182adc26f8083fab11db812eab3c2a
font_02_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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