Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41ac318e08da857…

MALICIOUS

PDF

100.6 KB Created: 2021-04-03 04:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 82cd34fd5f1cc7e2437ecdf359e1e45a SHA-1: 2596d16533d73460a897c0cd34dd0a603b19ab9e SHA-256: f41ac318e08da857311ea7da482d4ae73fc53f3e7c4500bbfafdd14f7561470b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the document's primary function being to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bologen.ru/award?keyword=testes+estat%25C3%25ADsticos+anova+e+t+student+pdf PDF link annotation
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/xiwinokavezili-nukibajoxu-zeguvutafekij-litimovarob.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/7682018.pdfIn PDF document text
    • https://lajidusok.weebly.com/uploads/1/3/1/0/131070852/d74fdd689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_6004ff4a0f588.pdfIn PDF document text
    • https://kowedanu.weebly.com/uploads/1/3/4/6/134687265/zuwitu-baxuxeti.pdfIn PDF document text
    • http://roxetoxuved.mywebcommunity.org/44232469355.pdfIn PDF document text
    • https://ligunetanojuwid.weebly.com/uploads/1/3/4/6/134625742/vapewuxukeguxaxobiz.pdfIn PDF document text
    • https://pudebotajiv.weebly.com/uploads/1/3/4/0/134012430/xiviwas_lixegogonix_tuzar_jetugufibuzak.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/symmetry_worksheets_ks2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427509/normal_5fe709ec974a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5fe15f14e1c1f.pdfIn PDF document text
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/pekikogaxoranir.pdfIn PDF document text
    • https://dovomarolod.weebly.com/uploads/1/3/0/9/130969455/2116840.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/38b70eb7-1b90-4068-9fd1-8c1eadf31198/42997214346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dec4946-2e59-4eea-9a12-25d4ecac827b/best_sangean_portable_radio.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/how_to_open_sodastream_source.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e48258f-7be3-4e98-9ae6-bbf8dcecdbcb/what_is_after_heir_of_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6e90b8-1d58-4549-94cb-aa0d7d42ce3f/how_to_use_tub_clean_function_on_lg_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496cb09f-be37-49ad-810b-860bf3a8992f/bible_trivia_questions_and_answers_king_james_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d677a50f-fa50-4fa2-8b95-40f9206a61d2/vizio_e601i-a3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae4699c-534e-43ea-9a06-b868bb6004c1/depasirilajopim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e86331b-035f-419e-8adc-bd6da457cc92/45855622781.pdfIn PDF document text
    • http://telusomabufa.onlinewebshop.net/tanabutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49293e2d-8782-4e70-8e94-c9ea82c825f4/honda_gx160_pressure_washer_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 1872 bytes
SHA-256: cf373f8eb364677dc8d29ae0cbe658a1b8665e9067f0cd69b3a2e84d4b370a53
font_01_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 5084 bytes
SHA-256: 876956d4c3c02987d24edc9ab44102ba86de17b9a5c6c12ca0525c78e728b335
font_02_sfnt_off00013fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCB 14592 bytes
SHA-256: e7363a03da3c32e9dd3842849e5159294cc71f3c47adf12686311f4b10f1dbd6
font_03_sfnt_off00016c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7E 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b