Malicious PDF — malware analysis report

Static analysis result for SHA-256 9687cfbf9c7b0c9a…

MALICIOUS

PDF

72.2 KB Created: 2021-02-27 15:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 352a58c63fcea7c4ceec7e68b54977d0 SHA-1: b640de5ecf8766a4cc6018702ce93367b1c6e5b4 SHA-256: 9687cfbf9c7b0c9ae6729aec44314a69f27ba04a8ee52fb0753df7a1fd6a9dbf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farms to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=what+car+seats+fit+in+the+baby+trend+sit+and+stand
    • https://zunotexiru.weebly.com/uploads/1/3/4/8/134890048/vavenaram.pdf
    • http://rubewox.sportsontheweb.net/what_is_the_type_of_economy_does_japan_have.pdf
    • https://retibome.weebly.com/uploads/1/3/4/6/134680472/09f377.pdf
    • http://reactivascotia2020.com/orbit_sprinkler_valve_issuesedla4.pdf
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5fd327f762092.pdf
    • https://cdn-cms.f-static.net/uploads/4393034/normal_6015ac1e4e12a.pdf
    • http://bonboxstudio.com/animated_emojis_for_androidqmuwb.pdf
    • http://santand-es.com/rcmas_2_subscalesz2kkw.pdf
    • https://vavozeja.weebly.com/uploads/1/3/5/3/135308761/69f0b78fe9.pdf
    • http://buwovavozu.getenjoyment.net/how_to_draw_anime_for_beginners_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4368243/normal_60374670390a5.pdf
    • https://static.s123-cdn-static.com/uploads/4456989/normal_5fecf0a22f188.pdf
    • https://cdn-cms.f-static.net/uploads/4450247/normal_600b42a580418.pdf
    • http://freds.space/mastering_bitcoin_programming_the_open_blockchain_2nd_editioneiylm.pdf
    • http://revilokepudidu.mygamesonline.org/kiss_the_rain_yiruma_lyrics.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kavibajegis.onlinewebshop.net/2126909938.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc89.bin
77c4781919ff5c0b6cabe3a475444895d1b0c796e9280964d6cacd1140cb8285
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 5332 bytes
font_01_sfnt_off0000eeb5.bin
45c6b00521c4bb0f429cca6d0fa2d7b13728c84e66c11fe7c89dc686b249315b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 10728 bytes