Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61c157fa228eee8…

MALICIOUS

PDF

77.1 KB Created: 2021-04-03 13:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf7c355ea411c5482e15d4117ce10204 SHA-1: 436cf770805bd9b67ff1e55d5e1ebe11ea91c18d SHA-256: f61c157fa228eee8d696afbc39c6b2af60f42302584522e44dd7653ffb63ff67
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The presence of URLs like 'https://midufefew.ru/wix?keyword=youtube+apk+cnet' and numerous weebly.com hosted PDFs indicates a phishing or content-farming operation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=youtube+apk+cnet
    • https://lukawonudos.weebly.com/uploads/1/3/5/3/135320707/d71beaa4.pdf
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/fipibanejapi_molefosibu_luzizine_jipepami.pdf
    • https://xovawezovikax.weebly.com/uploads/1/3/0/9/130969403/493427.pdf
    • https://jubukukovojiri.weebly.com/uploads/1/3/5/3/135306868/xazububowufojenena.pdf
    • https://modurofeg.weebly.com/uploads/1/3/4/3/134376635/c242a04.pdf
    • https://daregunomunozo.weebly.com/uploads/1/3/4/7/134723938/foremizad_lurutata.pdf
    • https://rejoxaratexudo.weebly.com/uploads/1/3/1/4/131453252/pevonivusuw.pdf
    • https://sogitinavebifi.weebly.com/uploads/1/3/5/4/135400198/zudaj-mazera-wutefalogilima-xipojejiwim.pdf
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/dafudovinedatisefovu.pdf
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/nanedomabatovojob.pdf
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/5303759.pdf
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/4515087.pdf
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/vapet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeroguru/ninja_professional_1500_parts.pdf
    • https://s3.amazonaws.com/tetofamuxulil/vufazalojozolek.pdf
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_8bb144bffddd48a5a1f5eb449cc76a9c.pdf?index=true
    • https://s3.amazonaws.com/legenapi/baba_yetu_peter_hollens_sheet_music.pdf
    • https://s3.amazonaws.com/bawalidamovidud/tujubaxa.pdf
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_46a12798b61949999e74798735087c29.pdf?index=true
    • https://s3.amazonaws.com/dixaleko/62833091991.pdf
    • https://s3.amazonaws.com/tobaziw/kejidoxebirenudodetefirul.pdf
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_f1a1d122112d48aab60a80d9c015733f.pdf?index=true
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_7a42f980bb7f40d6a40745d104ada5fc.pdf?index=true
    • https://s3.amazonaws.com/juzewojavomofew/84005585302.pdf
    • https://s3.amazonaws.com/lovetijif/xenadesukofulanujupubeluv.pdf
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_5782cdb94259454e8a9e3f54af710568.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3bb.bin
6372066f514fbf950ab2260d30e9c8973bc13be55f8ab15bb111a21b3cab9304		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 4784 bytes
font_01_sfnt_off0001041d.bin
3e6276e4b73702fb455a4bb6cd6e3e91b6324d7ba43801b2a57196ea734e0403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 10216 bytes

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