Malicious PDF — malware analysis report

Static analysis result for SHA-256 5065fa4237606268…

MALICIOUS

PDF

89.0 KB Created: 2021-04-01 03:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4a88110c81c536db008f6313d9c81749 SHA-1: 3ce9fe6bf004ee9550e389666e7c6a24ccb653ff SHA-256: 5065fa4237606268a4e8822c3e2d4c55e31643bcbebacd0042e85bf2058678a7
126 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, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/award?keyword=bangladesh+district+map+pdf PDF link annotation
    • http://flipping-car.online/jijepalewotonotiw7779a.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/Usjabdh/zesakutugesanu.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/tgh6hj7/18063401605.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/9786b7e6.pdfIn PDF document text
    • http://sberbank.services/stickwars_stickman_fighting_gameswkukn.pdfIn PDF document text
    • http://foyou.store/78964764510p99zz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5ffcc579d9f31.pdfIn PDF document text
    • https://kawolusasemosu.weebly.com/uploads/1/3/5/3/135397741/8255f.pdfIn PDF document text
    • https://cdn.sqhk.co/lusikagidet/jvGih4X/49444482348.pdfIn PDF document text
    • https://vewevemeza.weebly.com/uploads/1/3/2/7/132741136/pesovexovo_widonanejaguza_gikusajujen.pdfIn PDF document text
    • https://cdn.sqhk.co/wusirilunoko/hcSKSOy/sirapibodutenusikolesos.pdfIn PDF document text
    • https://fubediko.weebly.com/uploads/1/3/1/0/131070718/7147286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_604ca7279341b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_605f94e512598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_604078cd31407.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/f03baeff4.pdfIn PDF document text
    • http://lnstagramverifycentre.com/disifuzuwifebukomatqqlnc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_601a0de25339d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_3b089049c52549e0967dab54d218fd73.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_19aa8c33ab98435e8159b9b327a3fbeb.pdf?index=trueIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 5616 bytes
SHA-256: 45e357d8381a2ab474fbed72d2d410f356e65a848ca2211d07b42a752f2c6270
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 14980 bytes
SHA-256: acd624bb8c2a68f02e15857289eba944377a33417d4f9e3bcba07a8c7beede15
font_02_sfnt_off000130cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CF 10976 bytes
SHA-256: 28f5eb39e8df900fc6f725e4f33b2c11a1fb204322884c407d81d1910f42d878

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