Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c0bf551eb880bc…

MALICIOUS

PDF

83.5 KB Created: 2021-06-09 10:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9323f36c15ec5fe4190f61e26048677b SHA-1: 6a4faf5926d6ff905d73da270bcf2e2677b2abad SHA-256: c5c0bf551eb880bcef7b95e83cf9d93ccf6de0e7cdb3774fd4c0313c612592d1
226 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of 'powershell_2.0.pdf' in the document text suggests potential execution of PowerShell commands, although no direct script was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/pbw?utm_term=best+mods+for+borderlands+2 PDF link annotation
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/sowiwepoti.pdfIn PDF document text
    • https://boxuxalido.weebly.com/uploads/1/3/0/8/130814411/jowebazi_gurizu_daxagaxupujalet.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/bomedefukup.pdfIn PDF document text
    • https://repowuvosifopel.weebly.com/uploads/1/3/6/0/136050091/5689775.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/c1bbe662f.pdfIn PDF document text
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/fisamufineze.pdfIn PDF document text
    • https://repowuvosifopel.weebly.com/uploadIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvulareka.pbworks.com/f/how_do_you_turn_off_narrator_on_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b0a378-0645-41e9-83e3-6f026c831f2f/ligojilodupuxovujawix.pdfIn PDF document text
    • http://guvevef.pbworks.com/f/automating_active_directory_administration_with_windows_powershell_2.0.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144577776/yamaha_rx-v583_bluetooth_pairing.pdfIn macro / runtime command snippet
    • http://lekipirunezi.pbworks.com/w/file/fetch/144415863/59019903479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32599027-2ae2-4390-bc0f-f14e440da926/71199306781.pdfIn PDF document text
    • http://wonivefuruk.pbworks.com/w/file/fetch/144772065/spotify_premium_free_jailbreak_ios_12.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/w/file/fetch/144862716/50571091477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46d4fb3-9cdc-48dc-8d09-65054d208a3e/91806889302.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144913398/favumelipolegavexofaf.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/grille_salaires_convention_66.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144678393/95256656597.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_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 5372 bytes
SHA-256: 46dab4751e431f4fecc51de71f783f93aac3f4d9cc9066b24ad0dce1cc47cd68
font_01_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 11000 bytes
SHA-256: d1738c5974a79bfea34b5dfb17430da9883d3573e18257c8434f82783944d111