Malicious PDF — malware analysis report

Static analysis result for SHA-256 b054e51ba8a24971…

MALICIOUS

PDF

78.9 KB Created: 2021-03-22 15:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e595acdcb411a4b92779c1a566ded57 SHA-1: c23a162da893b5fa92f99530ff74513cc9a60608 SHA-256: b054e51ba8a24971a60fd0ba652ce1d86428d22501221747265f54c0ea2676bd
186 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 ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://xezojetit.ru/strik?utm_term=how+to+write+a+literature+review+paper', is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=how+to+write+a+literature+review+paper PDF link annotation
    • https://cdn.sqhk.co/rufebumu/jhJqXYf/star_wars_bar_theme_ringtone.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/hopeless_colleen_hoover_book_review.pdfIn PDF document text
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/4825328.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/el_general_naranjo_serie_personajes.pdfIn PDF document text
    • https://cdn.sqhk.co/jumapevuz/lhGkfJd/16377408005.pdfIn PDF document text
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/wibijifeviwiwokikif.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/patisserie_recipes.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/rurakafuxovukaxotu.pdfIn PDF document text
    • https://cdn.sqhk.co/kopupelek/SJVOifk/89126638812.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/6904649.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/kefusuduton.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_42c74488224b492e8c6e8fce1f5fd91c.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_cd27226a0bd24a76acedd4e2e4c23c1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdae0da9-95ad-4a0c-9e60-b56180bdf9cc/puribemelasafodixe.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/pulonesekifupovejugekitaz.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/differences_between_world_war_z_movie_and_book.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_3138728b1e9c47a0a8a2b90db76efd78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8edd44-0b6e-44c2-ab51-0109b346a7cd/how_to_get_coca_cola_kit_fifa_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da042787-4182-4990-9554-123c12b45f71/bugar.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_6c9e1424f34d410a9095167555d9b544.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8af2f8-7f80-4c24-8405-969cd0a4a74e/sony_hdr-cx160_review.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/russian_mink_lashes_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9ea688-13fe-428f-8f4f-f044353f97d3/fogirusolapa.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/sat_practice_test_11_college_board.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_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 4748 bytes
SHA-256: 9f83be5ed901cb3e302d5602399ec05c38e3ec79766048eb46b36020f486f430
font_01_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 10380 bytes
SHA-256: 2ba1cc1da71a9c759002c45aad7d85a7cb1656f889e594ac8ca6445952a34ede

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