Malicious PDF — malware analysis report

Static analysis result for SHA-256 171d09388dab7e43…

MALICIOUS

PDF

74.6 KB Created: 2021-03-04 01:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a6c668fcdfbf635e95f4d690e50d4ad SHA-1: 591ebc3fa3b0f800dd07005f5e923f5c29d6915b SHA-256: 171d09388dab7e432e359e91628454b6256d04eed16a19729ad552e639c61f84
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://mezovuduw.ru/wix?keyword=pushing+the+limits+al+kavadlo+pdf PDF link annotation
    • http://velesvoyage.ru/samsung_s4_mini_for_sale_ukinj3z.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/81842089991any6h.pdfIn PDF document text
    • http://losqutoq.online/free_bubbles_svg_files_for_silhouette_cameo_37bayz.pdfIn PDF document text
    • https://cdn.sqhk.co/kopozufu/OhdObFI/flight_attendant_book.pdfIn PDF document text
    • http://misstourist.info/singer_handy_stitch_model_cex300kjalkr.pdfIn PDF document text
    • http://shoppermarket.online/bike_ride_tracking_iphone2h95n.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/LVgdCW3/88050947346.pdfIn PDF document text
    • http://igbusinessabouthelp.com/information_processing_approach_pptf4w3j.pdfIn PDF document text
    • http://onlineeshop24.xyz/5e_shaman_unearthed_arcanaakg4r.pdfIn PDF document text
    • http://extraterrestrials.space/the_bell_jar_novel_download7ya8q.pdfIn PDF document text
    • http://losqutoq.online/715438838353768z.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/ghjTV5c/84508753979.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/kuraxojubuli.pdfIn PDF document text
    • http://ourfanz.com/iron_deficiency_anaemia_in_pregnancy_nice_guidelinesf53bg.pdfIn PDF document text
    • http://kindraretterath.com/the_beginning_of_everything_season_2_episode_17v2fy.pdfIn PDF document text
    • http://acgmgroup.ru/ansible_zip_from_artifact4z6ks.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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5484 bytes
SHA-256: 7e956a956a686dc7602d105bfdcbed7ba9f1a29e6676db5cb335b0eb75b9e8ba
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 10328 bytes
SHA-256: 97b9998f69995aaac7a56afbbfa39339d251bc8cfc283aedd1ed8fdb4a753545