Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7ea0cb2b609d85…

MALICIOUS

PDF

124.1 KB Created: 2021-04-01 17:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a7b92c7aacfce4edcb0f884ee8b3262 SHA-1: c464379b1f0e95a5142fc188804deb79d089bdd2 SHA-256: 7f7ea0cb2b609d85499be576e04ba3cc063991bbd39d9344cd58b88630788f6b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains, which is a common tactic for SEO manipulation or distributing further malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to direct users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/award?keyword=aditya+hrudayam+parayanam+in+kannada+pdf PDF link annotation
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/borusi.pdfIn PDF document text
    • https://rowumojonudelaz.weebly.com/uploads/1/3/4/3/134335227/3723117.pdfIn PDF document text
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/dorobofosu_gobiripasimo_vagezabanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_602e77ddc2767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fc7e5bf2d49f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5ff08af93084c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_601fee977a5f9.pdfIn PDF document text
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/6344110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475565/normal_5ff390b49ceb5.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/9234838.pdfIn PDF document text
    • https://rebasikerebevo.weebly.com/uploads/1/3/4/0/134016880/rafafijetukozen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5ff0887c3b0ea.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/0f2310.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/dcd1710a-87b4-47d6-af3d-ed2bb3f4647f/tilovoruxefezakusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fb2892-25eb-4ece-8ec3-1b596dd3af75/how_to_calculate_simple_vs_compound_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e3c85c-0f64-42ae-bc8f-de2b94013715/is_the_attack_on_titan_manga_complete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec8c441-4280-44d2-8fed-2751b51ccc53/weziwupelubibibopoto.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/98411130635.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/vigijadujemibowiwofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11f4547-e6aa-45d8-b2d1-95ad967f1465/16917325221.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000163b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x163B9 55284 bytes
SHA-256: c040a17f315557c0a7e989c4e2853855c766f90db60c01f9a638fe688ad368bc
font_00_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 5224 bytes
SHA-256: 2a2455b6edea9302356381756477098f3517dc831bed79db4e08a2d578864608
font_01_sfnt_off00014ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE8 2140 bytes
SHA-256: fd0baac36cf8fc893687cbe6b3b8165417b6c4fca046c9a5e64821bfdf5295b8
font_02_sfnt_off00015858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15858 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_04_sfnt_off0001bda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDA3 9688 bytes
SHA-256: f2efd0a3a998d71ea2248f2395aa2b758da6e02cf2b43f2e01e0e360be8fd0cf

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