Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ec3b5174cd0248…

MALICIOUS

PDF

93.6 KB Created: 2021-04-03 03:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b9606639147688d2a265d686030432 SHA-1: 57da17b74a51ed51486b8d5ad4e407bdfb278e7e SHA-256: 53ec3b5174cd0248a8b56300551b3f82c586394b6577ed63140406a07c360aae
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is https://botokaw.ru/award?keyword=ayat+ruqyah+rumah+pdf. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to direct users to potentially malicious or deceptive content, aligning with phishing or SEO spam tactics. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=ayat+ruqyah+rumah+pdf
    • http://meblik.su/marta_train_schedule_atlanta_gasze5z.pdf
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/cb929064ba.pdf
    • http://afracheat5.xyz/peptic_ulcer_disease_guidelines_20188v11s.pdf
    • http://mp4.design/allotropy_of_iron9bs5i.pdf
    • https://lelidejob.weebly.com/uploads/1/3/4/6/134643066/2816863.pdf
    • http://icub.tech/burger_king_menu_with_prices_and_calorieseycul.pdf
    • https://bezamefiparafu.weebly.com/uploads/1/3/4/6/134665790/wadegot_jeges_kewabufo.pdf
    • http://gufutaca1.xyz/green_room_imdb_parents_guideq64j0.pdf
    • http://milanomoda-italy.website/iso_27001_password_lengthlk1bj.pdf
    • http://naykaryadom.fun/is_the_2014_honda_odyssey_reliable7w1fa.pdf
    • http://itwow.info/xajajanotonogetifijidixq1cjq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/975d233f-fee8-430e-97ac-c8d1273cbe32/87523042616.pdf
    • https://s3.amazonaws.com/retobifulipo/lasoxumamoziruda.pdf
    • https://uploads.strikinglycdn.com/files/58f29a68-9b25-4d2b-a247-e609010378d0/4947519680.pdf
    • https://uploads.strikinglycdn.com/files/405574aa-c959-4144-8b75-2398afee3861/kellys_small_engine_repair_memphis_tn.pdf
    • https://uploads.strikinglycdn.com/files/9c768a8d-7e8a-4172-bc16-607957d9be69/68497245835.pdf
    • https://s3.amazonaws.com/divikufifir/sky_movies_hollywood_2017.pdf
    • https://s3.amazonaws.com/defipedibe/canon_pixma_mx922_printer_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/4c3899b1-50cb-4ae6-b144-3d44ecc336cf/xopukokekuw.pdf
    • https://uploads.strikinglycdn.com/files/d9ae9f82-f9e0-4cd9-b4ce-fda455cc9dfc/593122045.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000136ea.bin
0b39d9e9cf543f2f3359b9574d33e2072cd8d391f67b843f96acb1c3210ddf08		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x136EA 27924 bytes
font_00_sfnt_off00010009.bin
742295413c036ffbfce57affbaf4f68cb0bb3e79731ed7de3dc2122334e3a917		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 5288 bytes
font_01_sfnt_off000111e4.bin
8b7f4299fe35c77db122b9603392e9481f9cd2895f74ac29c2425882c358ca3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 11608 bytes

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