Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdf2714b5642a0a…

MALICIOUS

PDF

79.4 KB Created: 2021-02-27 09:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7786d7cea3c2c8f1dba8a338e375d007 SHA-1: 92faa3dedf628ec03b40f54ab82bc581ed416296 SHA-256: 1fdf2714b5642a0af8701f3e3ce25e5f66ca12a8bdca05dae43439d0ab49b42e
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://gimoguvi.ru/aws?utm_term=what+is+a+descriptive+paragraph+example PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377377/normal_5fdcb6fe40f5f.pdfIn PDF document text
    • https://xuzumuja.weebly.com/uploads/1/3/1/6/131636792/jodatad.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/7V55Vje/disneyland_hotels_open.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/kifovoroxatejibulinaga.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/how_to_export_midi_tracks_from_garageband.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/64b38773ca282.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/garowabiv_relubujajukup_sovafukumikajut.pdfIn PDF document text
    • https://paxuxitusokewu.weebly.com/uploads/1/3/1/3/131380341/ab196b8712.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/xudolu.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/zuburovipif.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/shark_vacuum_and_carpet_cleaner_combo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368266/normal_5fc6c61b1e052.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/1373744.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/dljegi0/pokemon_go_community_day_october_2020_research.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402032/normal_5ff0b4b1ba100.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/pigijazomule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 5628 bytes
SHA-256: 6f5d8a82bf716b18557ce8f1433de03a5b7d679536aa7dd63078573f25fc3240
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10540 bytes
SHA-256: 178e0f590639688155a61a947c2c33ecca5e61a159fade7a49772a5a5eb7d7c1

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