Malicious PDF — malware analysis report

Static analysis result for SHA-256 7345facdcb50febc…

MALICIOUS

PDF

77.6 KB Created: 2021-03-30 22:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1a2925f6fb8628dd0a46d39f87392b01 SHA-1: 290e9e7292c20a98958460e12fb448151cce4562 SHA-256: 7345facdcb50febcfa0fc047fa7e159ce661d7b486ee0cfa1533ad1b5c496ef6
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI and a high-severity heuristic firing for a redirector link, suggesting it attempts to lure users to the URL https://jumiwimov.ru/strik?utm_term=what+is+an+invalid+argument. The document body is heavily obfuscated, but the presence of PDF-specific heuristics and embedded URLs points towards a common phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=what+is+an+invalid+argument PDF link annotation
    • https://cdn.sqhk.co/pibepufas/jbFLHrF/tixibokopalewuginomelunof.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/86533199609.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/XjhHgdK/crossfire_board_game_vintage.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/lipozevurofotap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491705/normal_602337b8a0e42.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/1039398544.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/cara_membuat_cv_dari_word_ke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5fefc628df04d.pdfIn PDF document text
    • http://pakunobun.getenjoyment.net/zilomonulune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_601a3317e8530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_6017a399972e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_605c14c4ee85a.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/juneau_alaska_walking_tour_map.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/davawina/gotigogiwokafoxepi.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/limiluxefezerugufem.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/fly_tying_tools_made_in_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/how_to_set_a_wildgame_camera.pdfIn PDF document text
    • http://visunes.myartsonline.com/pemiwagosirorafofaxuseloz.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/best_chain_guide_for_1x12.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/ziveluzagigidezib.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_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 5312 bytes
SHA-256: 9ae125226b31ffec9e15300e15bdecb1c7597cc03d4bda01ce8bbf32b8ba7427
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 10800 bytes
SHA-256: 03c6203316fa8e30bb0789a0dbb0e6a938675a5ea1635c9b66607a55fb8e4cd7

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