Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5f4ffd8640023b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 23:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7563223a49ca41c149db5fe08d60de0c SHA-1: a4d59ad8f12ee62b0cde1ce654d84d4d94fee462 SHA-256: 2f5f4ffd8640023b424fb99c4bfb30d88e74de16ed1358d363b130097b7e7334
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of embedded URLs, including those pointing to known malicious infrastructure, suggests the primary purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=nerf+demolisher+mod+guide In PDF document text
    • https://losasogewago.weebly.com/uploads/1/3/1/4/131437886/065aaa7ae56405.pdfIn PDF document text
    • https://lemarowaverixax.weebly.com/uploads/1/3/4/3/134371099/ddc11ed432935d.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/asus_router_rt-n56u_access_point.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/bolufoxo.pdfIn PDF document text
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/bulinegikonaso_zomuwinajawiz_jemutoxino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390330/normal_60029d10142c6.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/viniv.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/58fef0f7b1db.pdfIn PDF document text
    • https://ronizizuvuf.weebly.com/uploads/1/3/4/7/134707383/rokideriba.pdfIn PDF document text
    • https://lutaxabivuk.weebly.com/uploads/1/3/0/7/130740512/zukuvepive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fdffff204065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477387/normal_5fe3324db101f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_5fd87571c43e4c8d90977ae7efd7d4d1.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_fd303d59237348f99c74be34f0f9eb42.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_485b67cbf08e4d4db223fd21ecddcafb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/describe_your_dream_job_interview_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/abbaigaru_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/list_of_best_penny_stocks_to_buy_right_now.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/morugomimekimobep.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/21648188307.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/rilufuripidobepabulo.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_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 5080 bytes
SHA-256: e369fa19cbae1e7d45f2051dbc9bcab63b1fd9122f1083cb1d50a90c3483bfcf
font_01_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 10856 bytes
SHA-256: f18b3d951c92c39fb678f5e46a08bd03ac4820298bde7671a010faf121a7a5a7