Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b8bb640083f2a0…

MALICIOUS

PDF

76.8 KB Created: 2021-03-01 23:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 04918590c75ba5424011681b7ce3afe2 SHA-1: f44b98167593c1101bff8f5ea91a78bd763dae80 SHA-256: 58b8bb640083f2a0554e05d1fea8e4ae6ea318d79f6b742c22a8923c14a50ce8
116 Risk Score

Malware Insights

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

The PDF contains a malformed stream and an embedded URI, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, appears to be a lure related to a common search query, directing users to external URLs.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://zajinet.ru/aws?utm_term=how+many+miles+does+the+dt466+usually+last PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5fc7a72aa9c58.pdfIn PDF document text
    • http://todayshop.website/9706303295221h94.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/neridigerumoro_zasejimot_palagizuk.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/waduzufudejumebusofizaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475382/normal_5fe52ca087862.pdfIn PDF document text
    • https://zelopira.weebly.com/uploads/1/3/5/9/135990333/jajumerukul-revupigamobaja-zijaki.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/80580533165.pdfIn PDF document text
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/4e6d4e3facc.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/gopikeriwo.pdfIn PDF document text
    • http://nomanodix.iblogger.org/jrf_keto_meal_plan.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/pathfinder_character_sheet_fillable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_602554c5bcb1b.pdfIn PDF document text
    • https://nopefulewipedu.weebly.com/uploads/1/3/4/3/134314682/487e7.pdfIn PDF document text
    • http://dobafeser.66ghz.com/dajajonigin.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/temujonuwu/gatupewinugewag.pdfIn PDF document text
    • http://nitubak.atwebpages.com/jarutelipuguxema.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/xivofunedezagupaguwoxesen.pdfIn PDF document text
    • http://lisiguzaxupego.epizy.com/alchemy_profession_guide_bfa.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/zotifabo.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/kivuja.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/carrier_30hxa_chiller_troubleshooting_manual.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_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 5368 bytes
SHA-256: b7487e00bcfab4eac047938a5517ed63d0449b6e61daaebffcc5132050ef989b
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10396 bytes
SHA-256: c7216d6da78f91634781f9512435da954e8b7c99b93fba52b9bc22caaa13d8ba

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