Malicious PDF — malware analysis report

Static analysis result for SHA-256 c951c77d622e9cba…

MALICIOUS

PDF

78.1 KB Created: 2021-05-29 07:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 39997f8b7ab7471513723639a1402024 SHA-1: db582138896df725872d0e47f2a25a9422aebc3e SHA-256: c951c77d622e9cba3db663344edbe39bcb9bb4c0e02bc1ef9e5693dd22324f69
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains references to 'simple recipe costing template' and 'wkhtmltopdf', which are likely lures to disguise the malicious nature of the embedded links.

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://seumenha.ru/123?utm_term=simple+recipe+costing+template PDF link annotation
    • https://fozumazajafipal.weebly.com/uploads/1/3/4/5/134588547/memotosoxeviwum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60474edbdc323.pdfIn PDF document text
    • https://vobelerevofago.weebly.com/uploads/1/3/4/5/134596527/575699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_6061bfd1da5a2.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/c04aa5c3.pdfIn PDF document text
    • https://puluduzi.weebly.com/uploads/1/3/1/4/131453343/gafadobutilowaweduri.pdfIn PDF document text
    • https://wemowojek.weebly.com/uploads/1/3/5/9/135993501/6055598.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/vujikuwemifubet.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/9c4c792.pdfIn PDF document text
    • https://wetebaxa.weebly.com/uploads/1/3/4/3/134343617/5c62dbe44ed224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_600d870048d93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fde4dcb68f2f.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/lojiturigejasimuri.pdfIn PDF document text
    • https://zexiditituluw.weebly.com/uploads/1/3/4/7/134734655/9047497.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5ff269e2804f0.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/guvatak_bovomitakokox_medeberi_nuzazenamowul.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/makezed.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/162de864-b07f-4406-9b26-87edcbb87c0c/63379745809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d1455f-ff64-416f-94e2-77b4bc2a1f02/garmin_nuvi_2699lmt-d_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945fded0-d606-4bbd-bf54-718f51256eab/who_regulates_shaw_academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43f404e-10e1-4a28-9749-f0c0a4d3c5bc/28560260589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c053601-c441-491a-b9ec-b384f1fdbd8b/full_focus_planner_digital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a5794c-1ccf-4af4-867c-7c0b8ca1f54d/winelisavonodad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2ad3a6-91d7-4000-adfe-da97eb56155d/tifijivaferelel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9beb874-c6ac-4efa-897e-ddb1b7932bb2/schlage_combination_door_lock_instructions.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 5356 bytes
SHA-256: b1f74eeecdb3f0da70333f7027b604de887a1af5f1cd02b5f6b4d6fc79378c8e
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 10956 bytes
SHA-256: ecec5baaf5f420018353b1f0aef8911de680409dac4535a384e40e5fa3cd3ca9

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