Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ca9fdadacd87cd…

MALICIOUS

PDF

79.8 KB Created: 2021-03-23 04:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6ce7d9df93c3b57290b1c79cf12385d2 SHA-1: c3d6263753e3464adb85872a6dc7f7fa321f497c SHA-256: 90ca9fdadacd87cd96ba6eef8ac6f87675d656f3e7612d9251a69a9ed7f018d0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://maypoin.ru/award?keyword=starbucks+availability+form+pdf+canada PDF link annotation
    • https://cdn.sqhk.co/senogewuki/hgpgegg/kumavuxafew.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/hgSjbie/blackpink_ice_cream_outfits.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/craig_jukebox_bluetooth_speaker_system_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/jicaghJ/rarosar.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/jdAjdhi/wanoxuwatof.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/4454069179.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/gQtiaha/stiletto_nails_extra_long.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
    • http://bobixupeto.myartsonline.com/sap_abap_interview_questions_for_experienced_candidates.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_21af1f0c9c7e4d89a4253feec85b28f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b261f624-713e-438f-87a8-20cd65760725/58872298471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b50879-7eb0-442b-901a-e717c6c818c6/how_to_know_acid_rain.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_d1c9b2c534e947649cdb6a743d05467a.pdf?index=trueIn PDF document text
    • http://futikuzita.onlinewebshop.net/kapuloxotizefidotakidabuz.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/weight_watchers_digital_food_scale_reviews.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_4c9505bf23ab46a0a753a543d072347b.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_74e3172496d14c52a7ea11433b18605a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e6619c-04a3-4faf-a025-81143fdc3bd1/92904154429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92fb1ee3-b6c0-481a-af3c-70162edf6a16/50872102830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1547eb09-8b83-419f-abc3-8fb8e9ad0ebd/92112808605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859378e9-3549-4a5f-9244-aee59058705d/lazarillo_de_tormes_adaptado_vicens_vives.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 5532 bytes
SHA-256: 0efefd09521d2d09dce1da19d5ff4f3429f26acfb86e238044f483d8378fe7ae
font_01_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 10912 bytes
SHA-256: f105fa7d32074295c4dbdeecccde41891508247a13bc9be22fe8617e2b412b16
font_02_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c