Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dec2ca758fb2ec…

MALICIOUS

PDF

76.4 KB Created: 2021-03-19 12:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aed85294cdea577baab734b8b183f6d5 SHA-1: 752bafcc8720a91c840d7c02cd73d14b0d65e4a7 SHA-256: 05dec2ca758fb2ec41d6e81e58943ed6178f3365b20e7fb5115dc737c575cc5c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One prominent URL, 'https://zajinet.ru/strik?utm_term=how+to+give+sales+training', appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=how+to+give+sales+training PDF link annotation
    • http://kibidusivojigo.iblogger.org/honda_gx200_pressure_washer_cat_pump.pdfIn PDF document text
    • http://kilagine.22web.org/xorexejatitobafudufigev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_e0ac782ccdc944f7903f5b09a8a89a3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63de143c-ada2-41c1-8b15-446fedb37821/85963780642.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_53e9bdf09dda46c88a871463e448a40a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c98ed09-b01f-4724-8708-d8ab7a8df555/dark_souls_2_dlc_release_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9736b6a-f9d0-4e4b-a9bf-544001d48c28/pukibego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f87b7a-2e9a-4203-bf32-e564a5934c1e/11087822565.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_3f804c8fcc99488aafeb5bb630764b93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15ae21e-90b2-4196-ad9f-3a817438be07/nespresso_vertuoline_exit_descaling_mode.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_60882ff934fb46f28c35edc540f6bd0f.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_064b7a59523740349190a31e7e8290e6.pdf?index=trueIn PDF document text
    • http://fifomivosa.rf.gd/79901658001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbe8d2c-206d-4ebc-b0d1-fad979e2c621/is_newsmax_on_dish_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a43d510-1484-48ab-a2d9-bc37b144fd98/the_beatles_for_string_quartet_yesterday_sheet_music.pdf.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_49e3730540064451b85712999dead627.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_c6677339a79f4e3cb84dcb7f25b119aa.pdf?index=trueIn PDF document text
    • http://rodowifesod.rf.gd/ipod_classic_30gb_hard_drive_replacement.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_61dbe83136084c42afbaf96f299a169b.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_bb6a43cf382e4a6b9e424c3e839d66f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09924eb-dd3e-4f49-b00f-5f7c1a16b5ef/flying_stars_2021_colors.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_2fd8ff54f7474e32bc1f7af4c9a10238.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_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 4964 bytes
SHA-256: cadef64d38bc20740c75c06e61506f369c21047675000da58c628ca96ce59681
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 10284 bytes
SHA-256: 8431a09fb8ac47b6f1d4d742bf0c69188209c12b94c4391559412b890926698b