Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d1b4a9b752256f…

MALICIOUS

PDF

85.9 KB Created: 2021-04-30 19:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 42fe20cbb7e1323954b80f6bf20831d9 SHA-1: 24a31d634b593043eff75d1dbbd77a4464c2280a SHA-256: b7d1b4a9b752256f4489b799f8f01a99fce52180bc2ef2da1d1899c94073a366
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs, with one prominent URL being `https://fokemale.ru/strik?utm_term=horse+feng+shui+lucky+colors+for+2020`. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, suggesting the primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fokemale.ru/strik?utm_term=horse+feng+shui+lucky+colors+for+2020 PDF link annotation
    • https://vixeweno.weebly.com/uploads/1/3/6/0/136049701/c0c287033df8fd.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/kurexulerazu.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/jozobinil-sapefivolasiv-kegeja.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/bebotazivipik_robitomekaz.pdfIn PDF document text
    • https://navowilupaxit.weebly.com/uploads/1/3/1/3/131381067/da7641.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/neveligakezolef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_6027a48c5bb0e.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/rerowomonatapirukes.pdfIn PDF document text
    • https://rawoxoduzipuk.weebly.com/uploads/1/3/2/3/132302868/peran.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_60278efc9c126.pdfIn PDF document text
    • https://wiwojuzikog.weebly.com/uploads/1/3/6/0/136050554/videparikirixa.pdfIn PDF document text
    • https://xezajorawelo.weebly.com/uploads/1/3/1/4/131408008/wiromorumix-masapuligogaxi.pdfIn PDF document text
    • https://nodaveto.weebly.com/uploads/1/3/4/2/134266094/2fd3806cb922.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/6031992.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/zajofero.pdfIn PDF document text
    • https://fujemolubese.weebly.com/uploads/1/3/4/0/134012375/nedobepebuso-fujojezezo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_376cc933077c42849df6866819956af4.pdf?index=trueIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_32313edaada54e6d9a407f9a759f4932.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_625727fc543d4090a2049142ac3c8763.pdf?index=trueIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_51c3358e9b4f45ffbef6a8b862ccc080.pdf?index=trueIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_8e1d5a2de9694ba88b34bfdff9fa4ec0.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_389c1c7a4e6a4dc4b7946f7bda0da587.pdf?index=trueIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_7268aeaa018e42969915ab02c2884526.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_5b4e020f4c8d4ccf931e1991afc694f2.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_c50b3b0ac9844e98a1d1e25c5c84e684.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 3360 bytes
SHA-256: 27abc8c8dbfe7fb24f1855fe4fccbb1f7fb61ea0a9a6b9493e5d3df7a32c5add
font_01_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 5332 bytes
SHA-256: 603ab5b3b4a6f9a6bf7cb7209a1e7778077e449f20b99ec163e06d0cce0be440
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 11208 bytes
SHA-256: 0458041794eda0e0f65ced10967379e645877ada23be1c39a3ff1535316d1ebf

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