Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6a72cbec55e153…

MALICIOUS

PDF

77.8 KB Created: 2021-02-23 15:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3b0f9bb271a05c103f4a4735bbc7cb9b SHA-1: 4122fdd2114217555e83e74f042be96aea2946bc SHA-256: ea6a72cbec55e153ffc02cfac11e34990c45398e2c08dde751326039e066eb09
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/wb?keyword=euripides%20bacchae%20perseus In PDF document text
    • https://cdn.sqhk.co/vovawumusa/icJ0jc2/waleli.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/8403421.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/geje6ib/sajerowura.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/gghejdH/6250609021.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/ejijeji/goodreads_app_update.pdfIn PDF document text
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/2824070.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/bGMMYrL/30904961556.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/Gsha2gf/58832563122.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/iiifR5M/69608963738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468551/normal_601efb176c0e1.pdfIn PDF document text
    • https://cdn.sqhk.co/velijituma/XgehicS/77490401852.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/hfTNiaS/jodomerikera.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/cjhzhbH/lavagozapuguvisit.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/aoJ5UMi/solitaire_princess_cut_ring_enhancer.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/bisiku/the_acquirer_s_multiple.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/carcereiros_2_temporada_mega.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/funezujobatafusim.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/womib.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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 5228 bytes
SHA-256: 351f75b167757ed9a742e8f82b1e65d547b9c5078012eb24e7e8d16ca65b7ead
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 17588 bytes
SHA-256: 8f51945a229e58b421f142e7cf978ab16ca127036ad2b3f95074f91a6f12b02b

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