Malicious PDF — malware analysis report

Static analysis result for SHA-256 d843e4a6c8b36016…

MALICIOUS

PDF

84.5 KB Created: 2021-03-23 12:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96f5b9af60c2bc06c09378d5ed57d5e5 SHA-1: d1b4984182a2379403ce90cc6681c40dcc7a4562 SHA-256: d843e4a6c8b360166d7f39d1ad543243ea5ca6cb151b21d8ea32c71aff09974c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier further support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=empires+and+allies+mod+apk+2018
    • https://cdn.sqhk.co/wujejelot/DiaSigD/akashaganga_2_trailer.pdf
    • http://hookup157.online/zitodaxevosimapovapazekuzk6l57.pdf
    • https://cdn.sqhk.co/wajidafix/hhcietO/xokuzibefamufozuzejam.pdf
    • https://cdn.sqhk.co/letareximo/ijjfwPS/cat_goes_fishing_2019_chomikuj.pdf
    • https://cdn.sqhk.co/lotidonita/dKyhfNm/wanapokozokumixa.pdf
    • http://gamedv.design/how_hard_is_a_plus_certificationjxet9.pdf
    • https://cdn.sqhk.co/naxaroja/fhfic62/creepypasta_chess_master_x_reader_lemon.pdf
    • https://malitizume.weebly.com/uploads/1/3/4/0/134097131/vaxugarikefulusofofe.pdf
    • http://vereffka.xyz/why_is_my_tv_remote_start_not_working5f7ct.pdf
    • https://bakinoxeveraj.weebly.com/uploads/1/3/0/9/130968963/e7ce485544.pdf
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/034f3276ea6.pdf
    • http://italywow.info/aircraft_dispatcher_armye324a.pdf
    • https://tivelagazevuw.weebly.com/uploads/1/3/4/1/134131505/2662864.pdf
    • https://zuwuloju.weebly.com/uploads/1/3/2/6/132681456/vijuxofolifer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://terexibuf.epizy.com/short_story_on_compassion_with_moral.pdf
    • http://zokitidekav.epizy.com/venajabepugabewodo.pdf
    • http://likasiz.epizy.com/ludenupotinaz.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_af777447946c483ea5f2e59236c7fc02.pdf?index=true
    • http://tobesonev.rf.gd/zidavemalitaxa.pdf
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_b6f534e41b22466fa460ec3ba07ae410.pdf?index=true
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_7cf334e936884e109d2f5ce1c7e43353.pdf?index=true
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_1e37f7f5f7d54c4fbac496a09974b6e7.pdf?index=true
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58d.bin
206c47769cc1658938700248782234ab986599d459427ebd744002fb682d8b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 5648 bytes
font_01_sfnt_off000108ae.bin
a50d38972a744c4b525b5a7474ab265e3b59178d74828570a9b938c77a96b9fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 10984 bytes
font_02_sfnt_off00012e7a.bin
5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16140 bytes

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