Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c8ba37bc606183…

MALICIOUS

PDF

74.3 KB Created: 2021-01-11 12:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 82c8b62acfb3f61279401cdf77cc0646 SHA-1: 39aaadd2ac87462e2975a41804ba9ca98066cff9 SHA-256: 96c8ba37bc6061833fbc9ce896c3b970e0ae89fd6bd1d7d6ebb75adf3350afcb
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of external URIs and link farm heuristics points towards an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffnew.ru/aws?utm_term=gravimetric+analysis+lab+report+example PDF link annotation
    • https://cdn.sqhk.co/loxinesupiva/ghbhfjh/color_picker_example.pdfIn PDF document text
    • https://site-1203447.mozfiles.com/files/1203447/crazy_for_speed_2_game_mod_apk.pdfIn PDF document text
    • https://site-1172255.mozfiles.com/files/1172255/rafapilawukud.pdfIn PDF document text
    • https://cdn.sqhk.co/fegokirar/rii0ZBa/retro_classic_arcade_console.pdfIn PDF document text
    • https://site-1177969.mozfiles.com/files/1177969/love_tik_tok_video_whatsapp_status.pdfIn PDF document text
    • https://site-1175001.mozfiles.com/files/1175001/42654997000.pdfIn PDF document text
    • https://cdn.sqhk.co/dorusafe/uFjaiiC/how_to_fix_virus_on_iphone_7.pdfIn PDF document text
    • https://site-1175777.mozfiles.com/files/1175777/offroad_car_driving_simulator_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/hjgQ7ia/m1_prepaid_sim_card_top_up.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/jixulo.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/wefemabeni/lelunodiku.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/zoridi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/xepabiwi.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_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 5480 bytes
SHA-256: 2cd5664e718cd6926820bf550a9c4dc30761786e289c11c50a6f358b5d13c6da
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 11432 bytes
SHA-256: 6ccecdecc6d576920b244b90d71548d9ae98b86109483a1febb963d5a024db3a

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