Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c13c8287cbb68b0…

MALICIOUS

PDF

79.0 KB Created: 2021-06-01 23:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be43efa0de97805876bfbec4156d4581 SHA-1: 78a53e718dc3149fdab72a64f5dc46f78df21a3b SHA-256: 3c13c8287cbb68b023a417a97c9363b20c0c032bf2df67fddd30cf7bacb38438
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. One prominent URL, https://crewmak.ru/pbw?utm_term=logitech+k360+volume+buttons+not+working, suggests a lure related to a technical issue. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/pbw?utm_term=logitech+k360+volume+buttons+not+working
    • https://cdn-cms.f-static.net/uploads/4403807/normal_600f2397a5546.pdf
    • https://vifaniju.weebly.com/uploads/1/3/4/5/134507083/b166a7.pdf
    • https://static.s123-cdn-static.com/uploads/4414851/normal_600870313755e.pdf
    • https://lukobuguw.weebly.com/uploads/1/3/5/3/135396798/8573528.pdf
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/veworinirogevetewusa.pdf
    • https://xonaxeritugu.weebly.com/uploads/1/3/0/7/130739926/1770797.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/7083411d5b1d95.pdf
    • https://fivomatimib.weebly.com/uploads/1/3/1/0/131070631/8615358.pdf
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/zosuja_zebuzonasitadin_sezozabijezem.pdf
    • https://static.s123-cdn-static.com/uploads/4420039/normal_5fc62903b1a62.pdf
    • https://cdn-cms.f-static.net/uploads/4379035/normal_6011e621e2aab.pdf
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/kazoruvamabow.pdf
    • https://zejifibesus.weebly.com/uploads/1/3/4/5/134586543/e28f4.pdf
    • https://panesevagumife.weebly.com/uploads/1/3/4/0/134041141/ee7b7f2c6c96e.pdf
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/sipab.pdf
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/junojovodefo-zofadotaseroda.pdf
    • https://biruvosuvibu.weebly.com/uploads/1/3/0/7/130739381/2370614.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zepadatoju.pbworks.com/f/naravusojajekaj.pdf
    • http://dipoziw.pbworks.com/f/what_are_upper_and_lower_bounds_in_calculus.pdf
    • http://ruwezebom.pbworks.com/w/file/fetch/144424962/6778898009.pdf
    • http://lakebimutep.pbworks.com/w/file/fetch/144418095/puwonirujekajuwiliw.pdf
    • http://pokatufaxi.pbworks.com/w/file/fetch/144421191/rules_of_exponents_n.rn.1_worksheet_answers.pdf
    • http://xoxafepapesu.pbworks.com/f/43343784848.pdf
    • http://dipoziw.pbworks.com/w/file/fetch/144451167/kagat.pdf
    • http://foxobekizax.pbworks.com/f/que_es_una_variacion_de_proporcionalidad_inversa.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d0.bin
334aab74a3fa8e08a68c5ad1106839e0790333f5fd4b33ba3eb316678c7a4623		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 5640 bytes
font_01_sfnt_off0000fbf7.bin
7ebbd0daffe8659db687429f7267ce7a996d6e75d1e8db588e4a10aa480e6bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 10604 bytes
font_02_sfnt_off0001201a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 4324 bytes

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