Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ddc815ff0354ec…

MALICIOUS

PDF

88.1 KB Created: 2021-01-10 01:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0e211be8b34bea27813d810f5fd751eb SHA-1: e53ea5e95df65c7577d1ca007032f49cc9cbbf05 SHA-256: b1ddc815ff0354ec50cb0175a419d3bf604ddbdcd7ffa581f54ab59cf37dd461
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is structured as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafffi.ru/aws?utm_term=boston+bruins+schedule+2019+pdf PDF link annotation
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/tijefinab.pdfIn PDF document text
    • https://site-1182058.mozfiles.com/files/1182058/zewafibofipep.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/ibRmNgh/maximum_cardinality_search.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/petamuzetiduvigukubamigi.pdfIn PDF document text
    • https://site-1167953.mozfiles.com/files/1167953/crazy_games_pixel_warfare_4.pdfIn PDF document text
    • https://site-1176369.mozfiles.com/files/1176369/94220177848.pdfIn PDF document text
    • https://site-1175083.mozfiles.com/files/1175083/comedy_central_south_park_pandemic_special_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/hcjiLi1/photo_editor_software_free_download_for_windows_8.pdfIn PDF document text
    • https://site-1217518.mozfiles.com/files/1217518/61768804121.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/gdthh4x/call_of_mini_zombies_2_hack_download_free.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/tetinesiwumago_wisutujivigili_doxefizok.pdfIn PDF document text
    • https://site-1174558.mozfiles.com/files/1174558/33479430718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 5704 bytes
SHA-256: cf9ff46a295be24b01e66993d93e06456f776c6bb85529832a493d0572f010e0
font_01_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 11844 bytes
SHA-256: 2dbd4c27640d1f99813eba38be745d92bc7c6fcdb87a1ca98b82dfa47c95c99a

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