Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3a22dbb2e8471f…

MALICIOUS

PDF

81.7 KB Created: 2021-04-25 19:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 31011b07f1b5e6f0b4a87bf83b027d7d SHA-1: 20239521936bb79f512890428793cea674bf4686 SHA-256: 4d3a22dbb2e8471f1f6362c04daa362e110a883334f293dc8c19c65f7a799b61
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The document body, though heavily obfuscated, suggests a lure related to 'skmei sport watch' usage. The presence of numerous external URIs pointing to disposable hosting, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, strongly suggests a phishing or redirection campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://midufefew.ru/strik?utm_term=how+to+use+skmei+sport+watch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fe0d12a04018.pdfIn PDF document text
    • http://complerbnp.com/35276704840gq86l.pdfIn PDF document text
    • http://wavakidagipav.iblogger.org/penosetopebunizifesalox.pdfIn PDF document text
    • https://zaxewunatomilar.weebly.com/uploads/1/3/4/1/134131499/4fb1ba08d.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/pazarugomube.pdfIn PDF document text
    • http://wumokejo.iblogger.org/who_makes_vita_spas.pdfIn PDF document text
    • http://dejozuguwulu.22web.org/nejatevameroko.pdfIn PDF document text
    • https://zegirapenutiv.weebly.com/uploads/1/3/4/3/134393596/zakemodexusum.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/8511200.pdfIn PDF document text
    • https://rijivujebevobog.weebly.com/uploads/1/3/4/4/134488471/442b3813.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/hbGhhgj/mashup_songs_download_2020.pdfIn PDF document text
    • http://how2clever.com/566744867277tx1t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5fc75cbaeb4b4.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/NZibzc1/red_ball_4_volume_3_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_6068cccc63fae.pdfIn PDF document text
    • http://fitokaps.xyz/harley_sportster_1200_service_intervalsconsw.pdfIn PDF document text
    • http://yellownatural.space/increasing_decreasing_and_constant_worksheet_key3mght.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxolivavaru.epizy.com/pumosarozo.pdfIn PDF document text
    • http://silabigajevova.epizy.com/gogexujekezez.pdfIn PDF document text
    • http://gezogiz.epizy.com/90231698829.pdfIn PDF document text
    • http://tinijev.epizy.com/klasifikasi_bunga_telang.pdfIn PDF document text
    • http://danidagibi.epizy.com/22348874864.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_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 5256 bytes
SHA-256: ceee5caf34d8d6be6a2cf212665e4a650e28ffb390c5c0f969c00e77a73e38a0
font_01_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 10956 bytes
SHA-256: 4d49f4683824bc0eb5c3be29e516c6345b5604fb9f7f6181eee99a33fcce2891

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