Malicious PDF — malware analysis report

Static analysis result for SHA-256 e919f5a7dbc63bf8…

MALICIOUS

PDF

75.6 KB Created: 2021-02-25 16:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2d87b9da89a38f127ffc4b98ee2d6e1e SHA-1: d724ad7119db7028577549ff68cbd69c3e682f63 SHA-256: e919f5a7dbc63bf8b63dab2b796506fdbc69db1f8f8ae37bf629d74bf7d0945a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'Cbt for dummies pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/strik?utm_term=cbt+for+dummies+pdf PDF link annotation
    • https://cdn.sqhk.co/vowibesep/BnWjiji/36174514889.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/nejiwofasezemopodomelo.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/jpw62fM/serodolaleloxogexomafal.pdfIn PDF document text
    • https://kabudinikibe.weebly.com/uploads/1/3/4/7/134716255/jisizib.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/rizisorutijuneligo.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/keputalomab.pdfIn PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/ripamete.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/ehjH9ck/mefesekadekozar.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/notevakawadaduxoretowu.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/denon_avr-2113ci_network_setup.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/3818795.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/zafaronivaj/wiwuvezenetabifiw.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/69598010605.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/28159068823.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/29432403967.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/brche_krzen_erweitern_bung.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/canal_digital_go_android_tv.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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 4992 bytes
SHA-256: dc4ddbca11c84884cd4a68332852af9cd1ec807e2941febca469ab632aa8a07c
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 10508 bytes
SHA-256: 83ab877a7f23e68b0ab5225adc187bdc84d33c6812c59ed98285db0e6044c4c3

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