Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6e89c3af4e40ea…

MALICIOUS

PDF

70.5 KB Created: 2021-03-16 02:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ebc69b224a487a87936568b24f5d291e SHA-1: 04536b64b4c55c9a621dcc239469ee656963b74e SHA-256: 0f6e89c3af4e40ea6a459f01221877f3d43ff254b57c24eb0ff6bc8f8b05afff
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a large number of external links, many of which point to disposable domains or are used in SEO manipulation tactics. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the document's structure and URL distribution suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/123?utm_term=diccionario+biblico+teologico+apk PDF link annotation
    • https://cdn.sqhk.co/baxoladipezu/2icgcrb/driving_school_2017_all_cars_unlocked_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/ehao1Ss/handwriting_practice_sheets_for_grade_4.pdfIn PDF document text
    • https://feminudusur.weebly.com/uploads/1/3/1/4/131407357/vipuzegegakarizemu.pdfIn PDF document text
    • https://gebogezajir.weebly.com/uploads/1/3/4/6/134685536/4e9c4f7555e.pdfIn PDF document text
    • https://bojijoda.weebly.com/uploads/1/3/5/3/135325587/f366b8d9504830a.pdfIn PDF document text
    • https://nozugaxuxanukuj.weebly.com/uploads/1/3/0/8/130813784/wevogolosizaliz_xilejonezeguso.pdfIn PDF document text
    • https://purolitawi.weebly.com/uploads/1/3/4/8/134894903/181bcf45.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/iaVBRil/48614033770.pdfIn PDF document text
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/xaxal_givazawar.pdfIn PDF document text
    • https://botabire.weebly.com/uploads/1/3/4/6/134629411/abc34c43fb08.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/fjcjidG/cookie_macaron_pop_sweet_match_3_puzzle_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78967ca-6889-47cc-9c82-903665f9bcad/yamaha_outboard_services.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_4b9e5b99091b48cb92edfec65f23ea8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/what_can_cause_burning_skin_sensation.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_c5d79baa46ab4f679f16a6593993a4da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/10010036552.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/58043440906.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/twitter_picture_er_chrome.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_35726e42ddd941638ac50007456adc99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/zukufonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361238c2-3edd-4c0a-afa6-d89d153348f0/12195971723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a1a6ba-e041-4ae3-a2d3-d7d66fbb86e1/vitexejojajekesovuzerorej.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_48059b1001ad46128ce25f6dbfa9bbe2.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 5128 bytes
SHA-256: 5dab381c336cc0c4cd053353d09287ede1cbf538d755f54c7f0cc0d5b00a8f8c
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 11636 bytes
SHA-256: b61f5e5c3d7dcde4e575af1310fd9fea5b7e7e31f5a3a13b0a0fe76bb22b3729