Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaad496f60d9d8e…

MALICIOUS

PDF

75.1 KB Created: 2021-02-03 11:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72620ea74833bd6c7f2202272e3f4363 SHA-1: 521417ac72dc5d72f74ff380671ec9c3428439d3 SHA-256: cbaad496f60d9d8e5ebe9f0aeceb610a6d43f087e05f2ccf95af289fdea0f39e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with critical heuristics indicating it contains a mass of external PDF links. The primary URL, https://maypoin.ru/123?utm_term=squash+ball+material, suggests a potential phishing or SEO poisoning lure. While no scripts were explicitly extracted, the PDF structure and extensive linking behavior are indicative of malicious intent, likely to redirect users to harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=squash+ball+material
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5fc8ab1928d0a.pdf
    • https://static.s123-cdn-static.com/uploads/4447878/normal_6006901d45ba2.pdf
    • https://cdn.sqhk.co/motulobugaji/7k8YsJM/one_punch_man_boyfriend_scenarios.pdf
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5ffe26ad5aa51.pdf
    • https://static.s123-cdn-static.com/uploads/4457561/normal_600264a8d53d3.pdf
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/foririvazug.pdf
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fed35465b0a4.pdf
    • https://static.s123-cdn-static.com/uploads/4376359/normal_5fc9af498fdcd.pdf
    • https://cdn.sqhk.co/tasokuxu/ja5q9jd/taken_souls_blood_ritual_strategy_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4382771/normal_600cf625b7f68.pdf
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/7375880.pdf
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5fc9d49e94370.pdf
    • https://cdn.sqhk.co/metexemoraga/8gdgeFV/nasa_mars_news_in_tamil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lakadutof/67728316528.pdf
    • https://s3.amazonaws.com/dozuga/xufiwuxebikux.pdf
    • https://s3.amazonaws.com/belapawerezuju/landforms_examples_worksheet.pdf
    • https://s3.amazonaws.com/lulelepese/melhor_antivirus_gratis_para_android_2019.pdf
    • https://s3.amazonaws.com/jepavilutabilel/rerutovamev.pdf
    • https://s3.amazonaws.com/nunakixuma/kamobibezumupileja.pdf
    • https://s3.amazonaws.com/vobuturinivi/subafibigamelixisuj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e877.bin
f601f4e1ef294ef42ef2cf50317374e338b5d53f6893127aa7c92b922fdd7c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 5296 bytes
font_01_sfnt_off0000fa4c.bin
3195071298f3ebbc6a6a6a9232ff5715ce2f1e59777b4516c1014446318c718e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10992 bytes

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