Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e747b006835f41…

MALICIOUS

PDF

85.4 KB Created: 2021-02-25 08:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 110f465012d6e9ff503871ea4b785189 SHA-1: 6137f42fef98eb40d0c208614ab36072caec63e5 SHA-256: 18e747b006835f418abd75c3c2057956912c4b0ebe1c4143f11f85ba50cd2da9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'assembly instructions' for a 'sportspower swing set'. The embedded URLs, particularly the one on 'bologen.ru', are likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself contains malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=sportspower+swing+set+assembly+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489993/normal_5fdf6e7849ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_602baee05db68.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/ktge9gd/musica_rock_de_los_80_en_espanol_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hjrhcjf/save_the_animals_save_the_earth_song_lyrics.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/hoover_floormate_spinscrub_replacement_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_601e8b5deaba6.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/fWHhaQz/62520944478.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/jchiTid/dubai_creek_tower_floors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_603113016468d.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/umrah_guide_booklet.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/fpjdjfy/44744828928.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/how_to_fix_acer_preparing_automatic_repair.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://s3.amazonaws.com/gateme/36777125401.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/91895851679.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/telorajizevukigazux.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/neopost_error_code_bas-23-038.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 5572 bytes
SHA-256: 0e6714cbb929a4c6241748d3ffdc66f6d0b56a9438dc7bbc1c75866ae71c2507
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 11600 bytes
SHA-256: 905ce659810ccc1a2d1a579c56b46c60a2b33a13b926758b371d3a752bfc3297
font_02_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 16296 bytes
SHA-256: 21d2c517cc0d2781f643886744ab2248bbe8d92ed1ab736cc2ad748918d5c6f2
font_03_sfnt_off000139d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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