Malicious PDF — malware analysis report

Static analysis result for SHA-256 1633e52f0f701824…

MALICIOUS

PDF

80.3 KB Created: 2021-04-01 02:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1ebf0ae9ce3d916c2377387afe0c8faa SHA-1: b8959c5fdba3b914b3b67bd5b67326d71af59853 SHA-256: 1633e52f0f701824e8bc610589776df3b7d25a20ae7ae6bab172ef4606e3e559
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'reading comprehension questions'. No scripts were extracted, but the high number of suspicious URLs is a primary indicator of malicious activity.

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
  • 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://kuzutuzo.ru/aws?utm_term=reading+comprehension+questions+3rd+grade PDF link annotation
    • http://fakexexu.sportsontheweb.net/feathered_dinosaurs_the_origin_of_birds.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/aieqjgD/77481538107.pdfIn PDF document text
    • https://cdn.sqhk.co/terisuzuji/gjjglhc/35830371540.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/jaguxuroferikagerukuwuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5fe5edbfae99a.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/IghA2b9/gun_sound_effect_pistol.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://coloradocustomelectric.com/computer_book_marathi_class_7lueql.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/Ijjhahf/sojel.pdfIn PDF document text
    • http://tadajixilatu.scienceontheweb.net/vuxegafasurez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_6037b3995bfd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492257/normal_6001478642e2f.pdfIn PDF document text
    • http://republvinb.fun/what_are_the_characteristics_of_anemiam34jf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_603bddab65d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_6056ef95cf887.pdfIn PDF document text
    • http://bitsracing.net/rendering_in_pen_and_ink_free_downloadrjg2j.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/ShfpjhL/award_template_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/ichfMhb/84330279927.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/iSsXyZ3/51568206699.pdfIn PDF document text
    • http://pekuxareja.22web.org/ancelotti_book.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/fifty_shades_freed_free_novel.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/jigeAia/fishdom_level_2500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numakuzugurewi.rf.gd/chinese_zodiac_movie_in_english.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_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 5752 bytes
SHA-256: 5fb495065b983be3601877b1c20dedf788b98ce347bcbacfda0cde03baac6f1e
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 10628 bytes
SHA-256: 37b509a20c0eccf2ab20f4277cae2b34e4077e16fc1af5f9f3a5debd8aefbf20

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