Malicious PDF — malware analysis report

Static analysis result for SHA-256 e252f79527a4e1fb…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 10:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a3cef1402427e0fae103cdd790a72c6c SHA-1: ddf437d23be1c517935bb81367c437796bbb7e84 SHA-256: e252f79527a4e1fbccf6e82c3ba5e685c3d2373e59936111c2607818e55dec32
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-risk heuristic indicating it's an SEO redirector for phishing, specifically luring users with a 'free download' pretext. The embedded URL, https://nipisod.ru/award?keyword=advanced+spanish+vocabulary+book+pdf, is the primary indicator of this malicious redirection. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://nipisod.ru/award?keyword=advanced+spanish+vocabulary+book+pdf PDF link annotation
    • https://cdn.sqhk.co/wosipuvetot/phe2Pjb/kozowesiwawa.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/jghjhce/city_drift_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/icVUjbQ/electrical_conduit_filler.pdfIn PDF document text
    • http://xopiredat.22web.org/26833995981.pdfIn PDF document text
    • http://susarivusu.22web.org/y_x2_4_graph.pdfIn PDF document text
    • http://bestrongbyg.com/fafuwexinexozahvk3.pdfIn PDF document text
    • http://matcobzor.ru/giraffes_cant_dance_filmy2ign.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/nikon_dx_af-s_nikkor_18-55mm_lens_pricesppou.pdfIn PDF document text
    • http://klossheff.xyz/16982910143ujvtr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3810e70a-43a9-4623-a4e3-91977db5b452/does_target_sell_sodastream_refills.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/analog_digital_and_hybrid_computer.pdfIn PDF document text
    • http://winaror.rf.gd/fowetoboxep.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/48712303956.pdfIn PDF document text
    • http://xugivazule.rf.gd/tugitolesej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d136439-3b5c-466e-93d4-2c68d35b157a/tiduxurozimumigunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b5b19f-2558-430e-bb0e-38f837ca3429/gisirezoresuj.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/camscanner_apk_full_version_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfea146e-0531-4bfc-9eb4-ab368e778363/93698388396.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/70983303966.pdfIn PDF document text
    • http://ligeziwofumupo.epizy.com/92746028194.pdfIn PDF document text
    • http://rebikesumusosu.rf.gd/kawasaki_4-stroke_motorcycle_engine_oil_10w40_1_gallon.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/remevatibigaxad.pdfIn PDF document text
    • http://nifopufu.epizy.com/6435831658.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_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 5596 bytes
SHA-256: 7d32eb835d3c36887f1d8756ab55bd2c1d4a43fea8794c9f3a64853276b9cbb2
font_01_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 10956 bytes
SHA-256: 801980a6e1fdae6adfced640017457196853631daca56e57ee636d9296eed067

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