Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c490ef1dad2bb08…

MALICIOUS

PDF

70.3 KB Created: 2021-03-16 12:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3845229115f84ca0a6be894f9cab2cbf SHA-1: 61c413f1c6e3a0f4ce86c08e6842ea0c12fa6a75 SHA-256: 8c490ef1dad2bb08eb5140bce081b206bb00ad9464121f22c8b39b812bbc691c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The document's primary function appears to be redirecting users to a large number of other PDF files hosted on disposable domains, suggesting a potential phishing or SEO spam campaign. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest a potential for malicious content delivery.

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://leonvi.ru/wix?keyword=kettle+run+band PDF link annotation
    • https://cdn.sqhk.co/tememukafosu/D8geMig/mifitirufikibasipim.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/16afde6c5.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/dvsgiid/69051801032.pdfIn PDF document text
    • https://koneligave.weebly.com/uploads/1/3/4/5/134581264/vikubisotuponewopux.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/jWicagr/acadian_driftwood_sheet_music.pdfIn PDF document text
    • https://jebopisozezir.weebly.com/uploads/1/3/0/7/130739828/8532061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451205/normal_5fec293b37548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fd628ec6b42c.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/hyuhhZY/35010152779.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/br7pih6/ruzadebutonulukos.pdfIn PDF document text
    • https://saredikov.weebly.com/uploads/1/3/0/8/130874194/3ddc7311279a.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/jerCojg/katexafurajibufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_60074ddad1abb.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/dgeBGDO/pictoword_level_518.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/DgjggBy/ice_princess_wedding_day_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/yHniegd/tower_of_llama_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/hgidQ6e/dan_the_man_original_game_download.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/22735332-5993-4706-a16d-4631afbbc92f/italian_phrases_for_travelers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81732380-8111-4e46-b853-c9007d74c8b3/the_making_of_the_west_peoples_and_cultures_volume_1_to_1750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff661754-b4e1-4d5e-afd1-5af7ec164216/xigarukatidixozetes.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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 4748 bytes
SHA-256: ca03de7767be2a432dcc647b735b1b333756bcbd5d4283ad310f2afc7d7f9933
font_01_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 11308 bytes
SHA-256: 7b90453a75c7263a022bc2c5ad30cf4a909bf3f06468b2142a501544a03b9f80