Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafaa453c00ad42f…

MALICIOUS

PDF

136.4 KB Created: 2021-05-19 08:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5faf2ced0a55876f3f90b2336ac9f096 SHA-1: 20c98d9e4454dda0d4c85e712c5a76978bd818fa SHA-256: dafaa453c00ad42f6568dec653402afa2c0415dc7858e7523c35f0c13a05fcdb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that redirect to a domain associated with malicious activity. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the sample is designed to lure users to potentially harmful websites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+kind+of+poem+is+kubla+khan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_603143b1cae75.pdfIn PDF document text
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/gusidanesadez.pdfIn PDF document text
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/texozigogufili-nazeb-sobonipasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477409/normal_5ff126bcd632f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472775/normal_5febdf15b3588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_606e8a82da9b7.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/kikagilovukili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_602f18b61c963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421365/normal_5fcef03f13410.pdfIn PDF document text
    • https://jupoxoguji.weebly.com/uploads/1/3/4/0/134097256/daxes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_6037fa2707728.pdfIn PDF document text
    • https://fixabewol.weebly.com/uploads/1/3/4/7/134711766/4606930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_6036d67826d62.pdfIn PDF document text
    • http://kanubanedagag.22web.org/nipawopezuvakalajikuvej.pdfIn PDF document text
    • https://zulupilasafa.weebly.com/uploads/1/3/1/1/131164294/wekereje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jonora/biblia_de_estudio_reina_valera_1960_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/espresso_menu_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/gupafuvuzivunowepinaxat.pdfIn PDF document text
    • http://giwinilugo.epizy.com/36087569131.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/66312247549.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/86274687958.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_off0001da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA09 5404 bytes
SHA-256: 0673424b1cb9756a42d956976f08a224b740514811e81d279faa595221c6510e
font_01_sfnt_off0001ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC52 11840 bytes
SHA-256: a6f8f5c4db0bdcdbd28833d6dcdd88d4a0c0620a78e20b0126abe29138f58d17

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