Malicious PDF — malware analysis report

Static analysis result for SHA-256 4682d3a743339593…

MALICIOUS

PDF

80.6 KB Created: 2021-03-13 17:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 219674c1089d51c22c096c53e5cb363a SHA-1: 0967738f7e9471ad8def3ae7a43a3fc219d3a7bb SHA-256: 4682d3a7433395930e6913d555045f7895ed8fa06c264b6e7c2ba6bcfa05b512
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://mezovuduw.ru/aws?utm_term=why+we+use+python+for+machine+learning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404753/normal_60171cb9cf6f1.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/1017455329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_6049aed795996.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/dawimozetaxifega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_602afabc4944b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368244/normal_6000c2e2be5a2.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/nabivijafigekegojijajijom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_60496ea7c44d5.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/baldurs_gate_dark_alliance_ii_ps4.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/9ad701fd-2428-4688-a59a-1df1487a5e59/koxomuwurudirigogoje.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_952c00f120ec451b9f0640df13ba444c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palevijuj/rowdy_baby_video_songs_free_hd.pdfIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_e1bd02ea093441279f17bec023591f5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/637fa76d-97bb-421d-87d0-5200f1222d40/givakebupuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a14cf06-ced9-42d8-8e9c-4028612d4aca/do_pure_substances_have_exact_melting_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ba8827-c6e1-4f68-ab0a-0a2d5108674a/89009469437.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/6303612503.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_d8794309c5a54b1fbf336f88ed99ea8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c280c0ea-d5e3-4dc5-952e-b76474b6eb24/2008-09_stock_market_crash_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6900525e-07d2-48a4-b657-9792842bfbb1/ronco_rotisserie_recipes_lamb.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/71273426233.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/gotiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaaa7eb6-4fca-4972-ab81-3f80685a1841/zigovujofawizonilep.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_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 5636 bytes
SHA-256: c5fbb9bc896556283121529ece926ec16f58fed6fa82fb38f6428a6256872a44
font_01_sfnt_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 10920 bytes
SHA-256: c5599d6a73a5f017709781fe51dc58e098fb82d0b803b1178b3327b2fa4db45b