Malicious PDF — malware analysis report

Static analysis result for SHA-256 8473a8291130aaec…

MALICIOUS

PDF

74.7 KB Created: 2021-03-30 14:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 76dc0b232b5a410c65b4cb926f9f6cc8 SHA-1: 199354154008d4bd8c86544d1928d8bda4fc1a7a SHA-256: 8473a8291130aaec0369eab8357008f3c157e4b7d68707999264d5d035bb94ab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://druttle.ru/strik?utm_term=how+to+play+annie+annie+over PDF link annotation
    • http://christmas-gift.ru/crock_pot_express_multi_cooker_manualltic3.pdfIn PDF document text
    • http://hargotel.xyz/3939056601a9fr6.pdfIn PDF document text
    • http://marketitaly.pro/watch_the_selection_free_onlineobl2m.pdfIn PDF document text
    • http://businesslinecenter.com/sugedimuderotaluhekvc.pdfIn PDF document text
    • http://easybranding.org/which_colour_is_best_for_night_partyfaz6e.pdfIn PDF document text
    • http://mybiol.site/gexusakipepilczmg.pdfIn PDF document text
    • http://lovepositions.info/fuxowepomusgdln.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/48fcbe42-b774-4875-a2c8-91179a4e059e/honda_civic_2006_radio_code_error_e.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/popuzipog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6945897-3084-413c-bf19-783e82e96297/how_to_turn_on_coleman_mobile_home_furnace.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_a53050038599466da916fcb4e9f3ee64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38538a8f-c070-421f-8e20-dba8d2453253/6.0_powerstroke_motor_weight.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_73e36e9ed130452a81a52f5bf75fb9c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba29ca9d-bf6f-411d-9608-aedcfa327f7a/26385639166.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/informerande_tal_mne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800d8b27-458d-4665-a310-fb7b78d552d1/55850739565.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_93c48575a57844bb930dbf62b0790277.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 4848 bytes
SHA-256: 7e743fa0009c10c092bf5754a75cc8c355a26294b4f9887a96eece5a1b01b959
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 10564 bytes
SHA-256: cc7074389b7146fc8a41fb59d4bfd9d02b34062ab73a21478ca5ac16f78e20b6

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