Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4b703b2f6d56a1…

MALICIOUS

PDF

89.4 KB Created: 2021-03-27 16:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f5a23346b4c6f4674e7f320ff80a7009 SHA-1: ea3caa4fdef902123861193ff3aed6fe6ea5aedb SHA-256: 1c4b703b2f6d56a1e69b5b8a35b015ef2c3a497af413c75a3d87115f43427721
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/wix?keyword=cuantos+watts+es+un+amperio PDF link annotation
    • http://jafoxidulez.mypressonline.com/53108747956.pdfIn PDF document text
    • http://farotosinotom.mywebcommunity.org/manorama_calendar_2020_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/roweziwamu/fYyqCib/34863467496.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/hhxjdge/81948495071.pdfIn PDF document text
    • https://cdn.sqhk.co/tinukomafiro/gdnV9gf/fupirefomi.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/AGyjhje/skin_tools_pro_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61509f9-d76e-413f-8b3e-6cbc5d03687a/nepavipimogodukorakazosev.pdfIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/43492473326.pdfIn PDF document text
    • http://zuniguvip.epizy.com/how_to_remove_brightness_slider_in_android.pdfIn PDF document text
    • http://dexadusoxeb.atwebpages.com/losajizaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a8a492-ce14-4e7f-b2eb-a715d2e7d383/getomokuzukiw.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/un_behindertenrechtskonvention.pdfIn PDF document text
    • http://zutaturusix.myartsonline.com/where_did_the_bible_really_come_from.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/6486121861.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/the_black_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/why_is_my_paint_spray_gun_spitting.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/zoporenijopumexofubetetej.pdfIn PDF document text
    • http://divamepirinati.rf.gd/alternating_current_calculations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a2b7bb-3f22-4725-978b-8fe3330f72b5/funciones_del_sistema_endocrino_y_sus_partes.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_02_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 4928 bytes
SHA-256: db228f3c4066b0d5929a9d6a0cb803e7f1da7f4d3d7b5c1ebf578a7d90deb169
font_03_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_04_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 12092 bytes
SHA-256: 6199154913074463b2432f3f87ce70b06aa2a7c18c034d5d3dbd65baca8a84a0