Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdeb8aa1b8a1a46…

MALICIOUS

PDF

81.3 KB Created: 2021-03-28 06:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f0dc794f3444f459f91e1b23e41e6290 SHA-1: 5fcafc4d5be8866cf1ed42b6aa6adfd5aa30902b SHA-256: dbdeb8aa1b8a1a464fa536a013ab3e4a2c916a4ce0edc3e1ab43e424493cb579
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=modos+de+produccion+del+comunismo+primitivo PDF link annotation
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/kezagoziwer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472494/normal_5ffe94652307e.pdfIn PDF document text
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/tegizemu.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/1xiZcjh/sparrow_sound_message_tone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/xUjbjdZ/bowmaster_prelude_unblocked_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/apibHhd/knights_templar_symbols.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_603a7808c9c36.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/sezogilikosote-nuzidejalime-ximamekujuno.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/WcifMzd/38832103313.pdfIn PDF document text
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/solirejisinib.pdfIn PDF document text
    • https://pitajuzijos.weebly.com/uploads/1/3/4/8/134885257/nogawubavafapa_fadupeguwe_dufolixe.pdfIn PDF document text
    • https://cdn.sqhk.co/nabixisaf/jg6jdKN/pewakajejalofadumurofur.pdfIn PDF document text
    • https://buvawaxeve.weebly.com/uploads/1/3/0/8/130874113/5f6ea32565.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/97697c3f-8698-4507-b117-c33b12513816/tipos_de_comunicacion_no_verbal_y_ejemplos.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_cf90505aa34a4558a355beca306d1d87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7677fe3-e904-4b51-acd3-8db195c41671/is_having_one_w_on_your_transcript_bad.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_65f314d072e542579b05d871f24bfb9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/496f8c03-09cb-4a77-9282-2c90c88a487f/adobe_photoshop_cs5_crack_hosts_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bcb28d7-5342-430b-b348-cd2cd7eb4609/67652764487.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_5dca2e4edae64633947be6107c37e687.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_7d6ac8efa5a34de8a8bdc1cb4a199d90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/051c16e7-a561-42f7-ba97-6298eba49992/foundation_and_earth_isaac_asimov.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_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 5076 bytes
SHA-256: 0bd8db8a621b4a8bf2aad96c81e9d12afa519e5a406546f2b2a911e951140ca3
font_01_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 11644 bytes
SHA-256: 209f29eb4656f18253e7abacd0765699ff6753401849fc09631382dd025a1f15