Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7f1a2e9381fbb3…

MALICIOUS

PDF

88.4 KB Created: 2021-03-10 14:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 338d657c80c5def5f2878c3284dfc6ff SHA-1: 1e99d317f641d344a6f0570da8b1e4059fe32e7e SHA-256: cf7f1a2e9381fbb3d8d65b625de253d16a7e1ecebddbf70e052ecdac0ff95492
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URL, 'https://jumiwimov.ru/strik?utm_term=sap+business+one+free+download+full+version+with+crack', suggests a lure related to software downloads, likely to trick users into clicking and downloading further malicious content. The document body, though heavily corrupted, contains fragments related to 'wkhtmltopdf' and a date, indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=sap+business+one+free+download+full+version+with+crack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393631/normal_6017bfa43a24a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_600e72e0222ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449996/normal_5ff1af7749683.pdfIn PDF document text
    • http://fewobamuge.iblogger.org/how_to_sketch_graph_function.pdfIn PDF document text
    • http://hotel-engels.ru/columbo_episode_guide_imdb5wl2m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_6032aeef07da2.pdfIn PDF document text
    • http://vonaguk.iblogger.org/formule_excel_arrondi_au_multiple_infrieur.pdfIn PDF document text
    • http://tazijiga.22web.org/adm_pro_apk_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408321/normal_5fce55779f454.pdfIn PDF document text
    • http://tertov.xyz/tasco_trail_camera_supportmsgxz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8afb5097-ff79-450e-985d-30a1f5e7ebec/lozazimewajezafeworitiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db14cb63-03ec-4073-87cc-0053ccc9b177/pokemon_handbook_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b85f5d9-0112-46d5-a5ff-e87692a6c658/jump_force_tier_list_with_dlc_2020.pdfIn PDF document text
    • http://xesidif.epizy.com/jubune.pdfIn PDF document text
    • http://ramogefakox.rf.gd/55519118256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a502cd-b927-4a2f-aa6e-df91f085f640/mizurajugexoxaluwivoxugo.pdfIn PDF document text
    • http://minirulo.epizy.com/light_blue_background_psd_free.pdfIn PDF document text
    • http://dilabopitomosif.epizy.com/burbage_primary_school_buxton_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3edb88-eedf-481f-832a-23fbd370c384/hp_envy_4500_not_responding.pdfIn PDF document text
    • http://bovamiwojilonem.epizy.com/tamobajakusegovanuwoliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4dc6eb-813c-429e-94e7-83e138dab635/83186619118.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 5584 bytes
SHA-256: 04612558b599708f5b239d99222118577a230a33842383a23f494deced4dce8d
font_01_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 11028 bytes
SHA-256: 2462244a7acc7c34f052780090e6f5880f37997b083213503028680e3e526c29
font_02_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 22492 bytes
SHA-256: 1347d42f5652f8c1df63c5270a3a416e6af128456810ca554cfd8b40971392d2
font_03_sfnt_off000142a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f