Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d74c8d61e8d6be…

MALICIOUS

PDF

102.1 KB Created: 2021-03-10 13:24:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 000ea653fad19b7792a6bac2540c73a4 SHA-1: d9412225fbf8b3a75782f576db7d794af0cdc89d SHA-256: 77d74c8d61e8d6be6438ae1edd3444c3d98216a798fc1b9dcb31c7ecef09437c
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to a 'guillotine cross equipment guide' and includes a high-risk heuristic firing for an SEO redirector link. The primary malicious URL identified is likely used to host or redirect to a secondary payload. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://kuzutuzo.ru/123?utm_term=guillotine+cross+equipment+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fc9b772d1e03.pdfIn PDF document text
    • https://cdn.sqhk.co/kasunelebak/ETpsIji/81602650032.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/aRuemMJ/inner_ear_infection_contagious_viral.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ff4faa17b78d.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/deB3fhc/angry_neighbor_2._0_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/ji2H01K/fukuduz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5ffd01325f7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5fd6a8859ee10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480408/normal_6022c00fd2ae8.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/bchjght/likolekafatowugip.pdfIn PDF document text
    • http://fepimedofosi.iblogger.org/gaxedepob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_600da5659091f.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/bjdfyhe/best_pickaxe_enchantments_minecraft_1._14.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/hfrghyj/call_of_duty_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/cVYIicS/97385746751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_6018f52f86da9.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/HoGji4G/truecaller_callapp_phone_call_blocker_free_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/iR438ha/3d_origami_paper_swan_step_by_step.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gadusevi.rf.gd/god_bless_america_original_sheet_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 5224 bytes
SHA-256: 10511380386503a7fe5a5367a6a22cfe4b36a1da20ece454933365c97fdc060d
font_01_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 12760 bytes
SHA-256: 497d72067937143ab50defd148cf5faf1097391d36a5510d70028e6b07e2d1f1
font_02_sfnt_off000167ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167AE 16124 bytes
SHA-256: 6e5f14b44ca3a668bd75165f7ca818f89c0bc95466b08ef3d44a4bd45a3d7e47
font_03_sfnt_off00017c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C92 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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