Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d1e1015bb40d41…

MALICIOUS

PDF

78.4 KB Created: 2021-03-10 17:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2348b83de1a1257d3888cd00845b66a8 SHA-1: 3d6455968d0ad5eac39b3804688755b75893f81b SHA-256: f4d1e1015bb40d410973ec942bb4c4156dbf2f91b1e7312e5e23be81dd869c28
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://dugedepap.ru/123?utm_term=freeware+spreadsheet+program PDF link annotation
    • http://lorenbayi.com/answer_key_electrical_power_worksheet_answersfu1vi.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/rinofeviroromarororitatif.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/hbzhhVn/alone_marshmello_piano_chords.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/xifimanibikixa.pdfIn PDF document text
    • https://bawejitomu.weebly.com/uploads/1/3/1/4/131438353/3867484.pdfIn PDF document text
    • https://lifovidas.weebly.com/uploads/1/3/1/8/131856672/9481111.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/29923711454qlkzh.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/iiixhbp/cloudready_usb_maker_2._0_download.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/gfHgehf/the_last_maverick_survival_pro_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xevuvuxene/iMzgdwf/border_patrol_academy_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/pulobegefuzi/cSkEgcA/slice_and_dice_bbq_menu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sofibimibojas.myartsonline.com/how_to_work_out_the_area_of_a_triangle_trigonometry.pdfIn PDF document text
    • http://ximedamolaxeve.epizy.com/ip_calculator_subnet.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_82841795f082489a8c47c9b61fa65860.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_0d5e9d48c85442ef95172efa6982b340.pdf?index=trueIn PDF document text
    • http://zeluwaboder.rf.gd/kenmore_microwave_over_the_range_white.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_42032c2df25a442cbc446d5c0d426598.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_efc2a1cad9f74eddab92829573dc0985.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_aeba19a858d647e0a6ad7bf904201138.pdf?index=trueIn PDF document text
    • http://gudanomakorake.epizy.com/avg_tuneup_2018_free.pdfIn PDF document text
    • http://perinuve.epizy.com/61019438168.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 5388 bytes
SHA-256: d2f58d0c0f55da3360559ae084733e1c23beccf85b54ac4c897f77181106a122
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 11172 bytes
SHA-256: afcf1dfb170ae4c542c610e2ee7959ffaf568de67a605cd9a4a49dbd1f595b9c

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