Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b70b520f05ea6e…

MALICIOUS

PDF

100.5 KB Created: 2021-03-08 19:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 297dee394f61af9a6f360f7c1e6bed5f SHA-1: cf5a4804902f088c39783ce4bf6604f92d056c55 SHA-256: 39b70b520f05ea6ed84179f7a8c2c0b76b29c339ed1e2f508bd68bb6d1dc160d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/wix?keyword=%25D9%2581%25DB%258C%25D9%2584%25D9%2585+%25D8%25B3%25D9%2588%25D9%25BE%25D8%25B120016+%25D8%25AF%25D9%2588%25D8%25A8%25D9%2584%25D9%2587+%25D9%2581%25D8%25A7%25D8%25B1%25D8%25B3%25DB%258C+%25D8%25A7%25D9%25BE%25D8%25A7%25D8%25B1%25D8%25A7%25D8%25AA+%25D8%25B1%25D8%25A7%25DB%258C%25DA%25AF%25D8%25A7%25D9%2586 PDF link annotation
    • http://paxenazubenib.mygamesonline.org/how_to_program_a_ge_universal_remote_to_directv.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/fallout_4_companion_module.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fd27dd062a34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495691/normal_5fc8660ac2613.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/goseso.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/99689221752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_6041d0a280f13.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/53b7401b-eb51-46a4-9c8d-f28e53034844/how_to_do_roblox_gfx_on_blender.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_f102311c27a24af6bc0494a482506c3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a3b9abb-71d6-49eb-aeca-ee6840d477e6/statistical_rethinking_a_bayesian_course_with_examples_in_r_and_stan.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_82f2e312665c4141975d367cef8be289.pdf?index=trueIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_94289ac8d67a4f5abe7ce83368811b66.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_aeadd228999f4d43933401807eae64e9.pdf?index=trueIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/70553048032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344e5c6c-9336-4439-bc3b-253b30a8e18b/94295142162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddf4e3b-0e49-4e39-9986-c57d0c31942f/zusurivaxegatiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa47d3d3-3823-43ad-bf71-ea07bb442e0c/how_to_write_compare_and_contrast_essay.pdfIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/34369681745.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
    • https://t.me/hamfekribetsIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014d72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14D72 28880 bytes
SHA-256: 1b2bdfaba7be1d98464825ad1b7b1f0bdea1bd93104519bb36da93b209a873d3
font_00_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 4548 bytes
SHA-256: 5891c5aa6c190bdafc43b26c70d9588b66f22d12057a558858c58a078d7d485c
font_01_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 9964 bytes
SHA-256: 9ac46cb1d4071495ac113dfd43c3491a690883b09bcc006e64c17e45ee938051
font_02_sfnt_off000130a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 18352 bytes
SHA-256: d2086e1944ed489b7f3aa85812f5f75e1033bd1beacbbacf70748bbf2bfae2fd