Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48235b741a13c69…

MALICIOUS

PDF

77.6 KB Created: 2021-03-06 07:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b5542dcb4b0522a1dfb32dfa399c32dd SHA-1: ffb94589a58a6f1c3802a7087e94fd0fc5fbe2be SHA-256: d48235b741a13c69b87999b96bfd9546e983e24902517df6f1d5776229ec434f
66 Risk Score

Malware Insights

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

The PDF document is classified as malicious by an ML model and contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm. The document body, though heavily obfuscated, suggests a lure related to 'word search puzzle books for seniors' to entice users to click on these malicious links, likely leading to further compromise or phishing attempts. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://nipisod.ru/aws?utm_term=word+search+puzzle+books+for+seniors PDF link annotation
    • http://zifujujefilat.iblogger.org/65273764947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457000/normal_5fde989fb95e1.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/where_can_i_buy_left_right_center_dice.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/68066126471.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/formato_de_avaluo_de_obras_de_arte.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_603e288a870a0.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/gavexafigemixiwu.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/bofavasusobilokitopudun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487897/normal_5fdd77c41c517.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a654b9db-c877-4377-8387-e49c19e579d8/63831586136.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_00d68f968eae4e7c817bfbedd3652819.pdf?index=trueIn PDF document text
    • http://pexomesukifek.epizy.com/clicker_keypad_change_code.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/why_is_it_better_to_recycle_plastic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fef4a6-22c3-4aa5-9bdb-afb3f79bda7e/witcher_2_troll_trouble_graveyard_location.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/81001087909.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_145bba6c1e4e4b98811cbf38f0b4c896.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_44d4c0c769f14bfe8728bd456d32b688.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_ea1044e0fe364c34982b5c9416c21e82.pdf?index=trueIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/fusionner_plusieurs_fichiers_en_un.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978918be-e4bc-412a-8a98-95ae4503ab1c/tork_1101_timer_motor.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_2e1d7cd658864aa69f5f60046116176f.pdf?index=trueIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/48953793477.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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 5512 bytes
SHA-256: 92e9c03d5d5184db6fc79a719699f9248d5ceb14b8365aae884dffd415cd9b4c
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 10848 bytes
SHA-256: 8800e9a0362fb5c39314d970d09505e6574129516913b178ec6c035fafb8125a

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