Malicious PDF — malware analysis report

Static analysis result for SHA-256 b290ad4b92bada4b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 11:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d2c30aff18b886dd9f249e019ec87f01 SHA-1: d8c278b63d8c5caf47e92973f3cc89d73857232f SHA-256: b290ad4b92bada4b7c7ee1af55e9a2fd53e068c0c6a655566321eb95a85a6177
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/strik?utm_term=does+nutone+still+make+intercoms PDF link annotation
    • http://domalitulefu.22web.org/pinel_biopsychology.pdfIn PDF document text
    • http://benovezim.22web.org/tuvatesuzewatazu.pdfIn PDF document text
    • https://kazowajobizitat.weebly.com/uploads/1/3/0/7/130775795/rumusunobakew.pdfIn PDF document text
    • https://mafupixalikufu.weebly.com/uploads/1/3/4/6/134662523/jurifevik.pdfIn PDF document text
    • https://kesaroxet.weebly.com/uploads/1/3/0/7/130775747/2281189.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/liihggh/scuba_diving_simulator_underwater_shark_hunting_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/gfib113/car_crash_test_simulator_3d.pdfIn PDF document text
    • http://nejenowavofol.22web.org/28789689967.pdfIn PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/wexakarut.pdfIn PDF document text
    • https://vakupakofusiwu.weebly.com/uploads/1/3/5/3/135399484/gonoxexutovuzuri.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/SjfVQXW/drive_in_theater_los_angeles_2019.pdfIn PDF document text
    • https://lebipogife.weebly.com/uploads/1/3/5/9/135990957/320c8174d.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/fNdcwjd/pakogekibubuletaj.pdfIn PDF document text
    • http://zadodol.22web.org/air_balloon_coloring_sheets.pdfIn PDF document text
    • https://buzumuramatetaw.weebly.com/uploads/1/3/2/6/132681877/xifatat-woguxipepa.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/jfic1ii/39058683965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaramoturowuf.rf.gd/bibel_schlachter.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/45039735482.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_8c48195ac0284485bbfcb35d2793c1bf.pdf?index=trueIn PDF document text
    • http://nebaxowowugi.rf.gd/51514912848.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_09b3d3b4f2524216a846dd26c318fd31.pdf?index=trueIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_d38e5c19f53f4284a0e984434ee438c5.pdf?index=trueIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_10dea3f334bf46e698399c98dcd288dc.pdf?index=trueIn PDF document text
    • http://numilovazafutet.rf.gd/71195856114.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_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5008 bytes
SHA-256: e89a667814634bf8f91a5c2300f53febeaeb8f2230b1ada01b112e790590f9b5
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 11172 bytes
SHA-256: 1dc06c189f6469cac96c314161f8454f10b98439c2ca01ba7cb8b496768c2c6d