Malicious PDF — malware analysis report

Static analysis result for SHA-256 741869fe3b9795cc…

MALICIOUS

PDF

89.4 KB Created: 2021-03-10 09:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 56b6c871003e20a09c517cd25dd2d871 SHA-1: 72379c7b2673a337499e5380be6f221005eb2340 SHA-256: 741869fe3b9795cc243a115062bc25f5a7fdb81859f753a6f53c5cc2fe5f146d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • 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.
  • 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://bologen.ru/award?keyword=adjacency+matrix+representation+of+graph+pdf PDF link annotation
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/486754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_6033a779b21bf.pdfIn PDF document text
    • https://kokarino.weebly.com/uploads/1/3/5/2/135299240/6fe11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_5fdb79202d17f.pdfIn PDF document text
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/4b04161ed.pdfIn PDF document text
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/vajomivaku.pdfIn PDF document text
    • https://xogefuvoza.weebly.com/uploads/1/3/2/3/132303221/135744.pdfIn PDF document text
    • https://zumizosapozogem.weebly.com/uploads/1/3/2/6/132681504/bdb83e380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5fd19a9467a0e.pdfIn PDF document text
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/bugobomujosud-zulopanozexa-sagov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fe36d53874da.pdfIn PDF document text
    • http://gotesukig.22web.org/nirarazeb.pdfIn PDF document text
    • https://juvumumirogo.weebly.com/uploads/1/3/5/3/135313675/224e7.pdfIn PDF document text
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/vozavuk-jeresojazugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c68658d8-766a-4d4d-9647-55ec1c62dad3/39648403254.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_fb1ceec17ddf4f0d909b134546ff85a8.pdf?index=trueIn PDF document text
    • http://gokixedotoj.epizy.com/fozixobiwujulebifono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6068da4-1073-4c26-a0ee-1502c7dcd4b8/what_is_steam_function_on_washer.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_827c855b40ae44038ae73a230482f789.pdf?index=trueIn PDF document text
    • http://giparirirowu.epizy.com/hoover_rewind_vacuum_belt_size.pdfIn PDF document text
    • http://zuromor.epizy.com/2010_dodge_ram_uconnect_manual.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_855d27e5b9b74bfc9bfd68ef43d7082c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f11bc1-fc50-4fae-b940-1ec6823672d9/50212771583.pdfIn PDF document text
    • http://diselukuxena.rf.gd/manualidades_de_navidad_en_fieltro_patrones.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_2a4d755494a849cf86e470562557f749.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cceddfed-171e-415a-8b4e-574712c9519c/51677488885.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 5560 bytes
SHA-256: 9176ed351a35fbf7dae413fe1329a9b8ddeade934680d32857ccf13d48556b42
font_01_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 10904 bytes
SHA-256: 5f68720403fde4619841b5ec8cf7e163e34853a1f7b219de950a11b2e1698be2
font_02_sfnt_off000133cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 16196 bytes
SHA-256: 74e4bca5570acc32d2b678326f6cc93b90bbc31b054854fdfe73a7a6c2241bf2
font_03_sfnt_off00014901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14901 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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