Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d892ef79e23f6e5…

MALICIOUS

PDF

94.7 KB Created: 2021-03-21 21:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 310f356822e5ddf531df597df1f6c0ce SHA-1: c91cdf9a0557a8c68a9b583943fb7b7ec09d40f0 SHA-256: 5d892ef79e23f6e5b53dd0c6c90f789993d2025369ad870860d08ab8fdb2a3f6
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jumiwimov.ru/123?utm_term=surah+ayat+kursi+full PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487626/normal_602897c9a80b7.pdfIn PDF document text
    • http://infokurs.design/mofudikomolagesutagoxodopwyln4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_602a27abba028.pdfIn PDF document text
    • http://arendaavto.taxi/wulidebojetofamuelba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fe1ce6a2461c.pdfIn PDF document text
    • http://instas.site/55871306683gutun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_60377a7db4f15.pdfIn PDF document text
    • http://autoupgrade.website/79517537541kjhpe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5ff2b9d1615cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_6001c29ae45f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_600a205a642fb.pdfIn PDF document text
    • http://nazhivy.net/286932378561rirq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_602c745673ff9.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/ac34e4ab-1ca5-43bc-83c4-438da3699308/57102702047.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_835122aae0494c319f06d1f90787971a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6361b6-a437-481c-8e4f-5125e18c021d/how_to_reset_my_nordictrack_elliptical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e366f7b-ce1a-49f8-9ac6-71d949721083/what_impact_does_globalization_have_on_society.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e10cc8-460c-4809-8ba5-907943e80fb7/asus_sabertooth_z97_mark_1_price.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_883679d9030b46e9aa763c673ee8bb2c.pdf?index=trueIn PDF document text
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_a2261178763a4305a6cd5adc35e8df2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8604631-f8cf-44fb-a358-6605bf606bba/xazovuwukinukomibetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883318d6-7764-4b97-8a5b-4c3bbded9e95/75081894530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1623b6f5-f03a-4f4e-b63d-159b074e5ccc/in_the_woods_tana_french_spoilers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e66c59-d90d-49dd-af98-0e61d5be1c5d/wubosaje.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_bc1d73e3191b4cb7b12a5fd85387a277.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc18b8d-8efc-442b-9a2d-c3296bafdfcf/200_gramos_de_harina_cuantas_cucharadas_son.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013c3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C3A 27076 bytes
SHA-256: 314c9f4703b2f2eaffa28bf918787dec7a32e399123c7540923712630f2de94d
font_00_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 5124 bytes
SHA-256: 279fe17f61ce885664dd8e9b46976af37410ad545a8baa459f31e43c0fa174ee
font_01_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 11156 bytes
SHA-256: 29b14dc9f6c78eb14c2b2205e570748a12c704c8b012019941e3583122cc7711