Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66cff0adaa8a798…

MALICIOUS

PDF

81.9 KB Created: 2021-03-25 14:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2242e569cdaa640b1c194f53bc1f76c8 SHA-1: 854594f8c03bfbcf104381b33dd8b5a7c4a15b49 SHA-256: a66cff0adaa8a79835471e8037a3319dff89c95cbca31b1aee59fabafd3e5bc5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Utp cable color coding pdf' to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://druttle.ru/award?keyword=utp+cable+color+coding+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fd3553369a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_6039e52e168c7.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/betabowunafe-dukevudolapepu.pdfIn PDF document text
    • http://4gusevshop.website/doubledown_casino_free_slot_machinezb1ta.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/tafseer_al_quran_in_urdu.pdfIn PDF document text
    • http://ndfnasg.xyz/how_to_calculate_pages_in_a_book0ki8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_6013465779e48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475197/normal_5ff1cfb2274ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_6056175c6d99c.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/xirozipo.pdfIn PDF document text
    • https://gufofusubovara.weebly.com/uploads/1/3/5/3/135323195/gidafiwel.pdfIn PDF document text
    • https://majabowuji.weebly.com/uploads/1/3/6/0/136092793/volapuwuzixokakuxusi.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/81497212787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gupizamowakop.myartsonline.com/23573232161.pdfIn PDF document text
    • http://vosojeki.epizy.com/rosemount_1056_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b16353-4f22-4b72-8b52-8cfde677f0d5/vejiniwepinisiwimuzapotik.pdfIn PDF document text
    • http://vekalaluno.epizy.com/fadufarawibewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06926be2-c0d8-45a9-b242-78d2bae6360b/themes_in_maus_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03cb507-aba4-48ea-8256-f532bd5985ed/hp_laserjet_4200dtn_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f05ee9-15db-4440-89b4-b94d6c26b201/single_crochet_stitch_for_left_handers.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/15854127476.pdfIn PDF document text
    • http://bazejufojowopor.epizy.com/bodyboss_book.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/noun_worksheet_for_class_3rd.pdfIn PDF document text
    • http://lagazirixul.rf.gd/zafibile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7d5655-c5a9-445e-84de-dfdfa54d635c/guwejevusenibovoso.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_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 5276 bytes
SHA-256: 52aa90ebbccd4391f620b4865f24dd902576dfe212264e93bffaa1d133d32ad6
font_01_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 10832 bytes
SHA-256: c4cec94b65c29a1421f4cc67c6a34ab54512fa0f3e76833f21ef1f23cfed4ca7

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