Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc247955e12ec9ea…

MALICIOUS

PDF

118.6 KB Created: 2021-03-18 08:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2edfacb2d767c4d1e5cb87bd81fc4ac1 SHA-1: 78710945760086ae6edcb62b48c3defca446cc28 SHA-256: bc247955e12ec9ea0d29cfb17f238a1a2118d2b171bada329f85d6c9778a2a53
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized URLs designed to appear as legitimate documents. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://seumenha.ru/award?keyword=b.+ed+college+list+in+rajasthan+pdf+2020
    • https://cdn.sqhk.co/merivexasug/eKggicS/plants_vs_zombies_2_pc_free_download_softonic.pdf
    • https://cdn.sqhk.co/xosuridasago/hcTa1gh/64021089488.pdf
    • https://cdn.sqhk.co/rapowipijes/7SUifgj/nubatafolabemilofi.pdf
    • https://cdn.sqhk.co/pafatewodoju/QigGGzH/56272619094.pdf
    • https://dukilukisa.weebly.com/uploads/1/3/1/0/131070258/b64a8484143e.pdf
    • https://cdn.sqhk.co/jaziwuke/yhggf8j/did_it_again_clean_loop.pdf
    • https://cdn.sqhk.co/dasofuduveje/dCdchIn/77047515494.pdf
    • http://setobow.22web.org/10991393881.pdf
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/wajejijonu.pdf
    • https://cdn.sqhk.co/kejofuvata/h4bgcc2/75794232705.pdf
    • https://cdn.sqhk.co/jugomuzuteb/FhhAigZ/torudavazinurojilo.pdf
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/zilaniporaduxu.pdf
    • https://xosaxunifepin.weebly.com/uploads/1/3/0/7/130739048/2912424.pdf
    • http://wimosam.22web.org/97758700530.pdf
    • https://cdn.sqhk.co/vefusujix/Ihbhbgc/fruit_splash_game_download_for_pc.pdf
    • https://cdn.sqhk.co/vojofarakiva/hOjfzih/26569622220.pdf
    • https://cdn.sqhk.co/lozuzupadis/hcJQ41H/62721878338.pdf
    • https://cdn.sqhk.co/kisesawaropo/YZhaicw/rush_limbaugh_radio_station_meridian_mississippi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://xifabopopotesa.epizy.com/90776183038.pdf
    • http://sasitegeke.epizy.com/68307925163.pdf
    • http://sitejaxikezo.epizy.com/mebegirosurinezis.pdf
    • http://zuniguvip.epizy.com/88457692661.pdf
    • 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016043.bin
0b222ecf2ea546e53838669a96c57066d57945b7645f7d5733858af48a6b7f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16043 5848 bytes
font_01_sfnt_off00017437.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17437 3720 bytes
font_02_sfnt_off00017f9a.bin
858da82276be3634b69dc56f5fdc5dfa3dd1a842235e7f97bc7a9f4ab64ed8ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F9A 10228 bytes
font_03_sfnt_off0001a2f4.bin
0a200f9d1ca273ab08f5e0633441f995c0bd526af8612b356d63215fb74ae13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2F4 13256 bytes

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