Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b1f517c5af9342…

MALICIOUS

PDF

78.4 KB Created: 2021-03-19 13:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01777d22997ec5bc18553d12c63f4230 SHA-1: 977b04dda59664042ccfd42166774e4031484757 SHA-256: 51b1f517c5af93426bf85e6babf8f46f33399fed4a3b0b8329792b4c5d0b2b23
186 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=powerdirector+pro+apk+full+version+free+download PDF link annotation
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/eaec85edb893e5c.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/tilukiwugixudodixes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5ff7ca01e11b8.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/rodemukemubifomog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fed8f7cd509c.pdfIn PDF document text
    • https://bagetakibejo.weebly.com/uploads/1/3/1/8/131871627/652c09a8c59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fdd430e23c62.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/sogerokaje_bebijurazusad_gumag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_2e3e298c7d59461b8798e458597f4a1e.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_ca90a260c06d49748d1e50c5a8c99992.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_fd0096a835dc4710bff265679992f3e5.pdf?index=trueIn PDF document text
    • http://kedisijusa.onlinewebshop.net/94463492436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6981dea7-50d8-4b45-b8a6-1ab732633973/what_is_meant_by_big_data_in_computer_science.pdfIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_e6a6ae9dd16d4accaacb9c5a67a65a0b.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_4b50d74a8bfd4ff2bf13ca17745035a6.pdf?index=trueIn PDF document text
    • https://76aaed32-5cd4-4d1c-8dfc-7c94b4e0b227.filesusr.com/ugd/23a6c3_b6076cc232434530bfdae2ca79468d72.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_5148dd98ad76411a936e2a9342cf5114.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_3605a96b54004f6bb213462d15e50515.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5259b229-04e4-47c2-833d-7a0fe94dfaa5/how_do_you_lubricate_a_genie_garage_door_opener.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_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 5364 bytes
SHA-256: 85d4c53a45f2c9e164efb26402c425cceacfb806a4c92b94d0ea52315f860859
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 12144 bytes
SHA-256: 9afb2255b0c299c3055c022cdcb2df125e5ede7eb6aac8cf9b62d03d9eaa49f8