Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aca53a46ad35b6…

MALICIOUS

PDF

70.6 KB Created: 2021-04-23 00:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c08464aa8ef350665a426c5fcf3d63e SHA-1: 219bbdca6de906ee7ba9b6ea1811304bcb42cdce SHA-256: c4aca53a46ad35b6a69e72cd4c00f64b669e7d4b9e9892b5b08452bd2f273fcd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=longman+phrasal+verbs+dictionary+pdf+free+download
    • http://winoraama.website/sevodilulotevudoama.pdf
    • https://cdn.sqhk.co/zatovafer/hdwgeNU/speedball_artista_pottery_wheel_canada.pdf
    • https://cdn.sqhk.co/rufonova/dcLNEjg/tanexovit.pdf
    • https://cdn.sqhk.co/sukonazukuv/hijcgcf/piggy_book_2_trailer_theme_1_hour.pdf
    • https://cdn.sqhk.co/mewobonovagi/aghiggd/fixavanufaf.pdf
    • https://bojotipawotos.weebly.com/uploads/1/3/2/6/132681617/volikoduvabeja_zujavigitorim_senagurasafi.pdf
    • http://psylath.com/codecademy_python_answers_2018lg1tn.pdf
    • http://summ-ita.space/anker_bluetooth_keyboard_codem3aaf.pdf
    • http://manthoughtswebsite.website/dungeons_and_dragons_books_5e_amazonb3e5x.pdf
    • https://zofawuzi.weebly.com/uploads/1/3/5/3/135323082/a1ed1.pdf
    • https://kuxelozipapim.weebly.com/uploads/1/3/1/8/131871637/4948905.pdf
    • https://dawewixorumerix.weebly.com/uploads/1/3/4/6/134633471/jegesovule_luwoligata_tovuma.pdf
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/zuvisofixizurojakur.pdf
    • http://erogan-encolumbia.site/61667743877eynpu.pdf
    • http://pabazumakubonok.66ghz.com/descent_into_avernus_5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vowenop.epizy.com/siguka.pdf
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_b3cedbe3f6a449d5a9d8234931da0e9a.pdf?index=true
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_91cc56bdf260439199462b3e0edf7b60.pdf?index=true
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_97533a5533304c2a8df043a582269048.pdf?index=true
    • https://uploads.strikinglycdn.com/files/208d6a4e-b09f-4ff5-a6b2-b17210cca8e5/list_of_paladin_oaths_5e.pdf
    • http://dipomik.epizy.com/robotic_arm_design_thesis.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_f8ff70b8d8114ae0947d69e83e142ff7.pdf?index=true
    • http://gelepovasogadax.epizy.com/23990868212.pdf
    • https://uploads.strikinglycdn.com/files/44e97085-b9cf-4a03-bc7a-b91ea19f5849/diversity_in_families_updated_10th_edition.pdf
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_652602f268eb47b7a0665d7538e45a92.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fc.bin
1100278d55950285dd71500574c041ec8433c2f80146341539e1bcd349fa9c84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 5904 bytes
font_01_sfnt_off0000e805.bin
6f1992dffd061218325303eb16c6acb847785962efc333f38836cb207678f687		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 10748 bytes

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