Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07ef63922e5214d…

MALICIOUS

PDF

64.0 KB Created: 2021-03-30 20:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5afc46f3775afa269ae2071e4a3b4320 SHA-1: 356887f23c3d0ab5f942b7ffb91695f9e940b14c SHA-256: b07ef63922e5214d31bef7342c7907a7f0347a6aa50db25f4b3c59f4d4634678
184 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

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
  • 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
  • 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://xajibur.ru/strik?utm_term=how+do+i+update+my+garmin+navigation+system
    • http://tipofeliluget.medianewsonline.com/living_room_interior_design.pdf
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/8477272.pdf
    • https://samugunu.weebly.com/uploads/1/3/4/7/134701516/0aa1c85c21.pdf
    • http://fumexijana.getenjoyment.net/fidic_joint_venture_agreement.pdf
    • https://vujajewuriwox.weebly.com/uploads/1/3/5/3/135387523/kowasisusi.pdf
    • https://dakuwiremab.weebly.com/uploads/1/3/4/9/134901294/8291298.pdf
    • https://xanerenidijuv.weebly.com/uploads/1/3/0/7/130739333/zuponasiwegedimawa.pdf
    • http://dopogabijup.mywebcommunity.org/how_do_i_setup_my_honeywell_thermostat_app.pdf
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/7045839.pdf
    • https://boxudeso.weebly.com/uploads/1/3/4/3/134320939/6046081.pdf
    • http://xomerisupudegop.medianewsonline.com/fefoladukevut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_6dc865028429409b98834466f1139c79.pdf?index=true
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_7d9f232aa69b4d9697732cce18f8f39b.pdf?index=true
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_fd7e9a97023e41e397dcac767e4691a6.pdf?index=true
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_d82c42e3abbc443eb7c3e70ba4844c04.pdf?index=true
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_16e0aa5b858649ecbd996aa2d5a201d0.pdf?index=true
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_bbb24f40a8f448a384998abcd143f8e7.pdf?index=true
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_3196876ebde14e0ab9e28d0dba7e6a72.pdf?index=true
    • http://satovimowenijor.myartsonline.com/experimental_archaeology.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc8.bin
54cde17f5638a544eff616e3b59b90cdc423f8589ff310c77bdbb3f91618b875		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 5344 bytes

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