Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56fcdb2b0324202…

MALICIOUS

PDF

99.8 KB Created: 2021-05-27 04:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8f7c7443c7637d3d6e69741b546d787a SHA-1: 94fa997947566154871120f07e282137d1c2520b SHA-256: d56fcdb2b032420293d1543659deaa3d9d5f2d803c60566de88f9619bde9cd1d
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 0.9992

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://xajibur.ru/strik?utm_term=por+que+la+molecula+de+agua+forma+puentes+de+hidrogeno PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375704/normal_6057e19a9ca7b.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/95ec7ff098478.pdfIn PDF document text
    • https://pulakaxumif.weebly.com/uploads/1/3/0/7/130776647/2358034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fd6588dedbc7.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/jugazutigibekizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_5fd7730d663eb.pdfIn PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/83b2a3f.pdfIn PDF document text
    • https://vetubopovitomux.weebly.com/uploads/1/3/5/3/135311090/votiwadifumijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411479/normal_5fef12c4c89e0.pdfIn PDF document text
    • https://fewabobur.weebly.com/uploads/1/3/4/7/134713859/8f4e2.pdfIn PDF document text
    • https://vamoketuvet.weebly.com/uploads/1/3/3/9/133999376/sumapowivefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_6046d98d2379e.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/4771158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_6032389c6c79f.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
    • https://uploads.strikinglycdn.com/files/9ab2a36d-928c-4fdb-8f57-8c24b37715e9/bevofopimewomoseliguvupol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3afc9b-de91-4960-885f-d3f0eda5c5de/the_company_of_wolves_full_movie_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e4deec-b85c-49e3-89b1-fb9a374e080f/savupotawawemerotevaladob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3afd726-587a-4d04-92ea-74a4db2c6cff/zexusuwofuzejifarenaxofuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad32cd10-e371-4478-9668-ba90c6da2448/bissell_spot_clean_proheat_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ef2d0a-7328-4e43-af17-c936dceed814/68552430402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8851cfe4-540c-473c-a966-0cd177677c1a/75913279359.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 5576 bytes
SHA-256: 514e9e6a9a6dbd1264adcbb8da5af8f3d71d2edaa07798b403f7e8bec1689aea
font_01_sfnt_off0001308f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 13288 bytes
SHA-256: 4031fe556f9189fd33f35d9f725aec307c31ba72a476ed613460e6413c35f9e1
font_02_sfnt_off00015bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD1 16136 bytes
SHA-256: 2df60db25c4006ebf5ce7f30ca7461b7931ff48239c1caafece913cf4cb3b6f2
font_03_sfnt_off000170c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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