Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b2d127bdede071…

MALICIOUS

PDF

87.2 KB Created: 2021-03-04 09:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e5e5948cb84caf1d280798264fe0d4b5 SHA-1: 563848dd8d80ea0ff9d05af3db7bd47c41cab7bd SHA-256: b0b2d127bdede07185039cb87c7db51f3d047fba5bd14d5aea919f38d6ee6b83
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://jottigo.ru/strik?utm_term=here+is+new+york+book', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=here+is+new+york+book PDF link annotation
    • https://cdn.sqhk.co/pinofizulag/ihAighd/sigiluxoboremizolag.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/briggs_and_stratton_craftsman_6.5_horsepower_lawn_mower_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/sezivalaw/SjiRCxX/professional_photographer_near_me_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/fjbFibl/lojapaletabixawitu.pdfIn PDF document text
    • http://xrootunited.com/auction_house_appleton_wiqzphr.pdfIn PDF document text
    • https://bezowaki.weebly.com/uploads/1/3/4/6/134611163/6155031.pdfIn PDF document text
    • https://faxitovi.weebly.com/uploads/1/3/4/3/134379512/muxegubexilid_gabudozagevinu_pezimutumuve_xetod.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/egjihn7/funny_among_us_memes_haha.pdfIn PDF document text
    • http://contentmedialiteracy.com/how_to_sync_jam_speaker_with_ipadgt855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/american_funds_breakpoint_worksheet.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/69997580005.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/lippincott_nursing_drug_guide_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 4796 bytes
SHA-256: 6c0fc0f62852a76492898deb3db4d840d3e88ce9b1510a292ab81054b1b03768
font_01_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 11452 bytes
SHA-256: 9a76d1d33f93494f491a868e5fbdd29bd91e1bc16fadc4c145641a7bc8e132f3
font_02_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 16232 bytes
SHA-256: cb0239a5e77cb37740da0b4997a5f47117ed526887f952b298c44ef8b2f17e18

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