Malicious PDF — malware analysis report

Static analysis result for SHA-256 af04b2079fcff70b…

MALICIOUS

PDF

81.4 KB Created: 2021-03-31 09:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6d0fbe1617c59aa00e82952cd1d81594 SHA-1: 52a77d9aee17b3749bd301cc41db17f8a60a920c SHA-256: af04b2079fcff70b0cf31f3acff23e34b48d1f981e4955b953845d79b7f0699d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_LINK_FARM heuristic identified a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs further supports the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=ralph+waldo+emerson+quotes+love PDF link annotation
    • https://cdn.sqhk.co/jumosanex/jcmBvhd/how_to_check_my_ufone_number_call_history.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/ePgjplP/uae_exchange_online_transfer_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/gusejemife/aM1Lmjg/sujasoxekutenosevus.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/Aglhdhd/domino_pizza_calories_margarita.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/dgdsihb/guess_the_movie_malayalam_puzzle.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/gjzhwEg/joker_2019_wallpaper_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/j7gijhi/talerigepub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_60552317afe2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_6039308d6d61a.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/XoGHwhj/92140826945.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/jjhifjc/adventure_escape_murder_inn_walkthrough_guide_chapter_6.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/cumulative_distribution_function_of_discrete_random_variable.pdfIn PDF document text
    • http://excellent-spb.ru/yasin_suresi_bilgisayar_hatl3skwk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_1b4cdf5a77c24e3fabf8979782e3158b.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_7d28b7c557134c99a3759043d10d1926.pdf?index=trueIn 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_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 5484 bytes
SHA-256: 63883c8970297f81ddf6579928aa08035e97061cd8cb530fe3e347ff0b6fa430
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 10616 bytes
SHA-256: 43d656212fda5aa648a37e04b6c403d36232842bb8b50a15c37cf2925f9d4153

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