Malicious PDF — malware analysis report

Static analysis result for SHA-256 baef7963263b04d1…

MALICIOUS

PDF

76.4 KB Created: 2021-06-02 00:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4bdc0b4a354dcf3f4503c446b8cffbc SHA-1: 4fad6ac860289fb6095318d6862bcbf23a31d202 SHA-256: baef7963263b04d1d54d5ca4e58cd9c215632ce9f66d0cf69656b377a677b8a1
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/123?utm_term=boronia+park+public+school+uniform
    • https://topirameji.weebly.com/uploads/1/3/2/6/132682330/vikubasujegogud.pdf
    • https://mufanujirube.weebly.com/uploads/1/3/5/3/135348440/wilaze.pdf
    • https://cdn-cms.f-static.net/uploads/4411691/normal_6038c97fc3587.pdf
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/sagevuwo-kifupo-zukatixi-rarega.pdf
    • https://vuxemirisem.weebly.com/uploads/1/3/1/4/131453034/7cd5066ed811ca.pdf
    • https://vuvowopivuvi.weebly.com/uploads/1/3/1/4/131410126/ruwezagasesaj.pdf
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5fff93b153585.pdf
    • https://suranekiwexem.weebly.com/uploads/1/3/4/6/134698667/topenuserunaki.pdf
    • https://nepujegoxamo.weebly.com/uploads/1/3/4/3/134380276/jereg-nefefa.pdf
    • https://cdn-cms.f-static.net/uploads/4420927/normal_600d6a8d58002.pdf
    • https://static.s123-cdn-static.com/uploads/4410956/normal_6001eec22f842.pdf
    • https://cdn-cms.f-static.net/uploads/4380863/normal_604468b9023d3.pdf
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/xazasafekitem.pdf
    • https://lotopunukulel.weebly.com/uploads/1/3/4/4/134473418/todukiwajog.pdf
    • https://cdn-cms.f-static.net/uploads/4401716/normal_60649b1f890e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vejivab.pbworks.com/w/file/fetch/144468204/what_are_the_basis_of_apportionment_of_overheads.pdf
    • http://bamedun.pbworks.com/f/todivuzan.pdf
    • https://uploads.strikinglycdn.com/files/3901297e-fed1-4724-82d5-fe18e2cee98e/sejalinazenolanuvemekebav.pdf
    • http://jajafad.pbworks.com/f/geometria_y_trigonometria_de_baldor_nueva_edicion.pdf
    • https://uploads.strikinglycdn.com/files/aa5f425f-adfe-47e2-a65f-14e9c3a57ad8/cal_mol_k_to_btu_lbmol_r.pdf
    • http://fodorafirig.pbworks.com/w/file/fetch/144475698/add_and_subtract_fractions_with_the_same_denominator_game.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144427386/fijinemavivejajanarenimoj.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_off0000edb0.bin
a5ff67a2b140020fd63e497066e3c4edf269a431cf0fb611e028297b07f6485d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 5508 bytes
font_01_sfnt_off00010044.bin
2736585cb7692d54903f7ea9635ced77ad0781169bfbbc50b8970ddb75b2727d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 10576 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.