Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c697b7e6357861…

MALICIOUS

PDF

94.5 KB Created: 2021-03-28 23:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0129df562fb6d512a4ac1c5870b6f18f SHA-1: 6905037aaed420c06c3bc1f1bf544958f02d59aa SHA-256: b3c697b7e6357861cb9b379f875bf991862d8499b379d81fb24ac68b15a141d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest a deliberate attempt to manipulate search engine results or redirect users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://maypoin.ru/award?keyword=apgli+loan+application+form+pdf PDF link annotation
    • https://jonabosaguvaxak.weebly.com/uploads/1/3/4/8/134858844/wopoletaki-fukuralu-nemegug.pdfIn PDF document text
    • http://debagigitefofo.iblogger.org/types_of_abortion_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5fda61a5342ad.pdfIn PDF document text
    • https://zurokexotuv.weebly.com/uploads/1/3/1/3/131384071/gepuxopivimovux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414691/normal_6008898714822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_600f262277bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_605114e51c400.pdfIn PDF document text
    • https://wovuxitijijigot.weebly.com/uploads/1/3/4/5/134524902/jabuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_605ef7ea4653d.pdfIn PDF document text
    • https://pepevifive.weebly.com/uploads/1/3/4/4/134480859/suketupu_juralada_gopamogit_tavuvima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497368/normal_5fc9d628b7784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_6019c1ab7641d.pdfIn PDF document text
    • http://puzezaxu.22web.org/36693977952.pdfIn PDF document text
    • https://ziganuridu.weebly.com/uploads/1/3/0/8/130815115/dbfdd55c120e7d1.pdfIn PDF document text
    • https://zofawuzi.weebly.com/uploads/1/3/5/3/135323082/4875449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479213/normal_600d27666d4e5.pdfIn PDF document text
    • https://lirujisigibat.weebly.com/uploads/1/3/0/8/130874608/850cf5462a8.pdfIn PDF document text
    • http://bogavevi.22web.org/himno_nacional_honduras.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/8672442.pdfIn PDF document text
    • http://xurixekan.22web.org/gosepenunizugabekegudedo.pdfIn PDF document text
    • https://pupifino.weebly.com/uploads/1/3/0/7/130776741/2d32abef198fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_6027174c8c2f9.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
    • http://zekubegem.epizy.com/advantage_and_disadvantage_of_reheat_cycle.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_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 4956 bytes
SHA-256: aeeb359c5a207f9b6aed4673224de62a9bb45bd48eedd0a197440da4da8297aa
font_01_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 11352 bytes
SHA-256: ba960b494f45049afba584b1f2f54dd881ffcca10d1f1dbf2543858b7b8d642d
font_02_sfnt_off00014737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14737 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
font_03_sfnt_off00015bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34