Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b5c2664f577178…

MALICIOUS

PDF

73.9 KB Created: 2021-03-04 05:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 985778d1920a90dd955210098e3b0f50 SHA-1: 7c6a1f7b27e93c19826cf1ee43f08ee0f787a87b SHA-256: 66b5c2664f57717852d4d6226e55ecae9de1d8e37423a86748d8c253975f5a41
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/123?utm_term=audio-technica+at-lp60xbt+fully+automatic+wireless+bluetooth+belt-drive+turntable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492580/normal_5fe438dbb56ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_60399ae29555b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_600b18911eac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_603e2941b980b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_6033a2da4fa53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5ff26b755e138.pdfIn PDF document text
    • https://gozuneputir.weebly.com/uploads/1/3/4/3/134345179/najudeperetubok-pozejoj-mitosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_601403a11a201.pdfIn PDF document text
    • http://train-home.ru/dutuvixoxibupujk018.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/1792603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_603328ac1328e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_601298ea060bb.pdfIn PDF document text
    • http://topfrag.rip/alphabet_sounds_flashcardsxdlha.pdfIn PDF document text
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/496f7e0.pdfIn PDF document text
    • https://kurenilomu.weebly.com/uploads/1/3/4/0/134042522/mepejab-tedexenesafi-fukesav-junojaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_60245cee3f9a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6005f499e22c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomapagovujux.atwebpages.com/twilight_portrait_movie_watch_online_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 6176 bytes
SHA-256: 6b269e71535a66643f0a7fcb5a19359ff911733ab88696f26e0a04ed3643a69d
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 2092 bytes
SHA-256: 49756e07528aa8acba1b4ec200caca7d47a711c4080628ae15593fdf803e2232
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10388 bytes
SHA-256: 1942c6e1d0160f276669ae6056783d30318a57d4031f3e8f85475f8083bd639a

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