Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f051b181697f28…

MALICIOUS

PDF

74.3 KB Created: 2021-03-13 13:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9ae52303be5b6cc864e73c301c79de80 SHA-1: 684a6a9e24204b0a921fc11cc523a98543f1a307 SHA-256: 23f051b181697f288c71bdfbc61faaef86e726467f73f4d63cc71cd21e845131
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to 'golowaki.ru', which is likely part of a link farm designed to redirect users. The document's structure and embedded links suggest it is used to drive traffic to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wb?keyword=power%20pressure%20cooker%20xl%20recipes%20beef%20roast PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457838/normal_600310ba01ccd.pdfIn PDF document text
    • https://sovokuragul.weebly.com/uploads/1/3/2/8/132814371/3653334.pdfIn PDF document text
    • https://rusofejez.weebly.com/uploads/1/3/1/8/131856127/fusonagu-toladubaluriker-gepepeganiso-kosaxibukagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_603e756d0eaca.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/YhbUXgj/acellus_sign_in_parent.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_601d941b72582.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/zetov_kizolefab_fuwef_mopokixajajoniz.pdfIn PDF document text
    • http://vas-rem.ru/how_old_was_light_in_death_notecosb9.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/jvMhbKN/billie_eilish_wallpaper_2020.pdfIn PDF document text
    • http://trokot-shtorki.online/the_curious_savage_scriptm4iha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_60489b351b392.pdfIn PDF document text
    • http://pro-komp-master.website/72273269425jlw0o.pdfIn PDF document text
    • http://rte-ita.fun/english_reading_comprehension_for_grade_17tx3l.pdfIn PDF document text
    • https://xevowuzari.weebly.com/uploads/1/3/1/4/131437308/tituj-guramoma-zarizojigo-xelozedotuf.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/gedezobabudot-wowiwifuko.pdfIn PDF document text
    • https://nusufonofa.weebly.com/uploads/1/3/5/3/135341523/767822044191.pdfIn PDF document text
    • http://mylic.ru/movimiento_uniforme_y_movimiento_uniforme_variado8a46i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/75561081717.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/ver_pelicula_el_diario_de_greg_2_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/78950140319.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 5372 bytes
SHA-256: 96c67c4a556bf5da7541918e2332a9b19878465f5037e941aadd21f755ddaa88
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 10884 bytes
SHA-256: 1ad882ea78ce03e7ff04fa9d5749b14455038152956e6e126eb2d1154180ef67

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