Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc05ad6c58e077d7…

MALICIOUS

PDF

71.6 KB Created: 2021-02-22 22:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 814d6d5ba309cdfd095a845e580e9ca1 SHA-1: 0e1b3d08c3fe81013005a5f1f6e72391b2791a5c SHA-256: cc05ad6c58e077d7c8a3ea8d3a9be1a2fa3ac6957f5f31c5a8eea0bd56d9866a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, forming a link farm, and one prominent external URI that appears to be a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of external links, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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
  • 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://maypoin.ru/aws?utm_term=wimpy+kid+character+creator PDF link annotation
    • https://cdn.sqhk.co/gojelonub/a7fkdUs/50778276675.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/ghIibgg/vuferodupizojiwuwarokizev.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/e458cf755d35ecb.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/tjfw1jb/54703759005.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/p9icxie/takebexose.pdfIn PDF document text
    • https://cdn.sqhk.co/retuwami/bijigii/gikumowokepuwejiba.pdfIn PDF document text
    • https://vopobibipudo.weebly.com/uploads/1/3/4/6/134620476/sujatepiratixi_tilakazefol_levof_zojojipopu.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/cibsU15/how_to_fix_holes_in_drywall.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sisigetevi.rf.gd/viziw.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/56760498204.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/30081074269.pdfIn PDF document text
    • http://dewelimu.epizy.com/5041245.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/84301502881.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/audient_asp8024_he_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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 5280 bytes
SHA-256: 15f5d57dfc8f90fe42496158b59aab31680f9944d99cc8a7567cef2407c82715
font_01_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 10168 bytes
SHA-256: a1c13ef69c17180e41d9e9d4163e3d601251d162c8bdb827fa5ce9438e7bd04c

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