Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3be88f06d7f446…

MALICIOUS

PDF

139.1 KB Created: 2021-06-02 09:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d0960a0302c79909a4d106adf5b58e45 SHA-1: 25a1141b2cf5250c2d636ee7645fd186b9385c1a SHA-256: 4e3be88f06d7f446f11f019834eadcc5a4abd7882573a630611032c096743288
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9934

Heuristics 7

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://soxebez.ru/123?utm_term=sql+server+express+localdb%2528+msi+installer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371799/normal_606e2d3d6818e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_604e5aa14b096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_602e395621927.pdfIn PDF document text
    • https://vaxonarug.weebly.com/uploads/1/3/4/3/134378521/gafuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_60224d226d2af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_5fdbe51c08b72.pdfIn PDF document text
    • https://nibolujadi.weebly.com/uploads/1/3/1/3/131381302/dovebo-gazapijinowekoj-gipujonudin.pdfIn PDF document text
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/6500325.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/vereboxunenim_nevun_bugesom_punilome.pdfIn PDF document text
    • https://rojikejasixut.weebly.com/uploads/1/3/2/6/132682083/wafewawefob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5fe519a847874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fd1193622b3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5ff5cf0b97512.pdfIn PDF document text
    • https://zobagitolofoxaz.weebly.com/uploads/1/3/0/7/130739917/fc1ab9bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_5ffb583f89aa0.pdfIn PDF document text
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/715521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_605f59c9d4854.pdfIn PDF document text
    • https://buposaxive.weebly.com/uploads/1/3/4/4/134494270/sodagemaxaxivur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/860b2917-96aa-4170-aef8-cf34e1485e2e/zero_belly_smoothies_reviews.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144414738/velocity_time_graph_worksheet_answers.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144485349/gemefasedirive.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144416085/72591554177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967019a1-da11-4d78-93a0-8a272ed1ba40/oscar_et_la_dame_rose_brief_4.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144467373/25622914433.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/tiponemekipurusikiviseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7257a28-88d6-4e40-a696-74cf79b2edfb/kozafepobarufatonumev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac852e6f-c5fe-45d2-a8c2-6afcad4de707/wogenowesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b75239b-85f5-4ec5-92e3-01d177001a92/kigav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 76412 bytes
SHA-256: d931f362c45ecdbc21f75591e1e53f9c2b1eb696bea68eb99fff4099838ca4c8
font_01_sfnt_off0001e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E543 5792 bytes
SHA-256: b0778d502a8e06d0867995d81c4abea5eed26a2368b85b01ce1709a8756853ab
font_02_sfnt_off0001f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8F1 10420 bytes
SHA-256: c45e0323159f094f603b625c216290d49bc26183a89f3335d7bd6e78562ae46c