Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07c43010ba0a124…

MALICIOUS

PDF

73.1 KB Created: 2021-03-25 02:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45dda4d7c86033e7db493b3c54ba947 SHA-1: ec89a1517cfe14bd30603ef0fc33ed29f787a46d SHA-256: b07c43010ba0a12491c2294099fb458e18b2ef23957da0fda15bf0168b96c8e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The PDF contains a large number of external links, many of which point to domains designed for SEO spam, suggesting a link farm or redirection scheme. The primary URL, https://golowaki.ru/award?keyword=neoplasia+intraepitelial+cervical+y+embarazo+pdf, is part of this pattern. While no scripts were explicitly extracted, the PDF structure and the nature of the links strongly indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=neoplasia+intraepitelial+cervical+y+embarazo+pdf
    • http://masterpowerpoint.com/38207655672314j5.pdf
    • http://usmileofficial.site/baked_chocolate_pudding_recipes_easy6l5an.pdf
    • http://anarchymedya.com/technical_drawing_free_downloaddzer8.pdf
    • http://natnat.fun/92582917807b9kyg.pdf
    • https://cdn.sqhk.co/pulovafafita/fjbjhgj/attention_screen_time_stay_focused.pdf
    • https://jipuziloki.weebly.com/uploads/1/3/2/6/132695969/5419626.pdf
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/muter.pdf
    • http://kataeta.club/how_to_stretch_your_legs_to_become_flexibleip1nu.pdf
    • https://zubefexer.weebly.com/uploads/1/3/1/6/131606337/voromix.pdf
    • http://albatros-trans.ru/vedotudetetuzu0mown.pdf
    • https://zidefiwemisuj.weebly.com/uploads/1/3/1/6/131606537/patinunajinipox_zilusi_dimekazomefipu_xadekujefiwazog.pdf
    • http://lnstagramverifiedbadge-form.com/sudorudofarif1sxqg.pdf
    • https://cdn.sqhk.co/vagofedewat/IUnUMhe/final_fantasy_dimensions_2_apk_download.pdf
    • https://cdn.sqhk.co/bigulikexupa/lgfhaHy/world_war_polygon_ww2_shooter_rexdl.pdf
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/8171525.pdf
    • https://cdn.sqhk.co/letaziseb/jhDa1UG/persiapan_motor_matic_untuk_touring.pdf
    • http://idealica-tufficiale.website/ideal_gas_law_problems_worksheet5dkne.pdf
    • http://salebox.shop/manual_de_reparacion_de_motos_italikaczr0d.pdf
    • http://parralax.net/3ds_rosalina_guidet6f1r.pdf
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/a21aabcfa95.pdf
    • https://zoninezazazi.weebly.com/uploads/1/3/1/0/131070362/zagekix.pdf
    • https://sewimoranekodov.weebly.com/uploads/1/3/0/9/130969375/b03284.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dc8b.bin
9c5bac1781e42816cfd95a6cefad1d86596741e761ba9eb91f7e61ad473b2487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 5620 bytes
font_01_sfnt_off0000efac.bin
97f20d2ac19f89a9779d6c5fa102f68ed018d7921e76c8458637d7e0dc68709e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 11360 bytes

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