Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b00dbe8a077e20…

MALICIOUS

PDF

85.8 KB Created: 2021-04-08 16:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 881338794fcbb5c76c29eea3e6b3d5ab SHA-1: 2175dd2c37c535d6d3996f3f3de377e3c3b29136 SHA-256: 72b00dbe8a077e20c66f0d097eebdb20ba02c314ed2ec9389ef72971690b5824
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'magic chef refrigerator repair service', which is likely a pretext to drive users to the malicious URL. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://golowaki.ru/strik?utm_term=magic+chef+refrigerator+repair+service PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445125/normal_5fcd7219ebb60.pdfIn PDF document text
    • http://itsamorem.com/homedics_sc-531_manualp4kge.pdfIn PDF document text
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/pejogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_603f7c690e61a.pdfIn PDF document text
    • http://stavki-na-sport.site/example_of_book_review_tagalogdv6fb.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/vozesameke.pdfIn PDF document text
    • http://blacktea.space/brimming_with_love_full_movie_online7qi7x.pdfIn PDF document text
    • http://dowelatevitik.22web.org/akg_p420_vs_c214.pdfIn PDF document text
    • http://fegekeketed.22web.org/lufomebofuvalovedawuzof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_6033f235f0df8.pdfIn PDF document text
    • https://pasironukid.weebly.com/uploads/1/3/0/8/130814081/guzirumutef.pdfIn PDF document text
    • http://fuxuxixigu.scienceontheweb.net/88843473559.pdfIn PDF document text
    • https://samoderusewon.weebly.com/uploads/1/3/1/3/131383586/1339f.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/10475333477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_5ff52547ceb67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494451/normal_5fe8aabe7bf5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daforewepon.epizy.com/pineapple_pen_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/wobibojuvoxogekezikom.pdfIn PDF document text
    • http://bejumajiluwod.rf.gd/29494621558.pdfIn PDF document text
    • http://solezod.myartsonline.com/etre_avoir_present_exercices.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/ielts_writing_task_1_british_council.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/12427719057.pdfIn PDF document text
    • http://winimoviwimi.myartsonline.com/current_transformer_saturation.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/correct_plural_form_of_alum.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_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 5308 bytes
SHA-256: ae125903d57e166903c3937288438ea90d7d167826f1f13993868385c09840ec
font_01_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 2348 bytes
SHA-256: 73258a10f39be242123724c3e50af54424a54535eb4c3f52b1ae73895281c538
font_02_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 11816 bytes
SHA-256: 93e95aedbc02720d1ad325b16a81574d68e00bb17829d538032fdf18d0e9f557
font_03_sfnt_off000133c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C3 16096 bytes
SHA-256: da9784c099e5a8bc41ab28ab6b0f706bbb561d129e983fef757841920625d5e7