Malicious PDF — malware analysis report

Static analysis result for SHA-256 930759050526457f…

MALICIOUS

PDF

88.1 KB Created: 2021-04-09 02:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe33e90e7fd4193c4e692c7757170ca2 SHA-1: a93bc16ad7e0d8da9946cc6e4424a651f355bc1c SHA-256: 930759050526457f6e3c2d2b06d2398f93f145d63ce0691bf84a0e0a44b6dadf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is 'https://gimoguvi.ru/strik?utm_term=what+governs+the+law+of+contracts', which is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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
  • 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://gimoguvi.ru/strik?utm_term=what+governs+the+law+of+contracts
    • https://cdn-cms.f-static.net/uploads/4412570/normal_600dc600a2b00.pdf
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5feaf3249e16b.pdf
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/levuxeladapig.pdf
    • https://cdn.sqhk.co/xutazazo/giSge9q/wafabedituminojunojeratim.pdf
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5ffba4501f0d5.pdf
    • https://sigojexubaj.weebly.com/uploads/1/3/2/6/132682800/0f7fa61a4.pdf
    • https://cdn.sqhk.co/pikikunifav/cv5hiTa/anti_malware_for_android_mobile.pdf
    • https://cdn-cms.f-static.net/uploads/4456998/normal_6060a4eed1b70.pdf
    • http://lunepemebixapal.22web.org/canvas_add_syllabus.pdf
    • https://cdn.sqhk.co/gixobujikelu/wjch14l/diners_club_card_bmo.pdf
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/d5106.pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/6f89045992968.pdf
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5fee0fb81358a.pdf
    • https://cdn.sqhk.co/gegefemorosu/hggXl0J/wosarenude.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_d4bbdcda3521433ca525e0c14a607bc1.pdf?index=true
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_d3a4e5bbde454f89bed6b4ab868f3762.pdf?index=true
    • http://sosotiw.rf.gd/evento_vascular_cerebral_tipo_isquemico.pdf
    • https://uploads.strikinglycdn.com/files/eaff42a5-d712-4587-bb00-0830d97af3b5/82090871213.pdf
    • https://uploads.strikinglycdn.com/files/d9fec6cc-c9be-4290-b5c9-374effe9aa6a/rodoniveteta.pdf
    • http://panobamufa.epizy.com/74445938645.pdf
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_60b49210cc834bfda724ff327e200efe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58924f6a-8eee-4545-9862-be78610eced1/wulivezomoxemunaber.pdf
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_44907d9fefdd4bc89713098d85b3d95c.pdf?index=true
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_14d6e7ca66fd445891a27a35f65e7e68.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa8.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 6744 bytes
font_01_sfnt_off00010b8f.bin
f840dd32b6aecc3ed1beab1056c05b56fc22f62f278df9182371bcaa619e77a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 5048 bytes
font_02_sfnt_off00011cd4.bin
c6d183b99433f5dc186af50ae603ba2f2bc4d06d7f05e247db2f88867c9fe903
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 11692 bytes
font_03_sfnt_off0001441e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 4324 bytes