Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82fc6912a5e4a89…

MALICIOUS

PDF

89.1 KB Created: 2021-02-17 11:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 83a6930311c4a2d53d989e6b082d1125 SHA-1: 9612d9ca02c63bf08e5809dafe7fa77d1d139190 SHA-256: f82fc6912a5e4a8911fcf833c583c2b2bd508a9c3019a39de7d9773796901e92
104 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, indicating a high likelihood of malicious intent. The presence of an external URI and embedded URLs, combined with urgency language in the document, suggests a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a potential attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=cultural+anthropology+asking+questions+about+humanity+1st+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417213/normal_6017a82570b96.pdfIn PDF document text
    • http://xemopubuga.iblogger.org/3598463218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470387/normal_5fedd71f76c75.pdfIn PDF document text
    • http://onlinesos.tech/pemobebolipirudevegezobohd4cv.pdfIn PDF document text
    • http://xxlmature.site/naga_patrilineal_societyga01n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_6026b2bbc5e70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373016/normal_6000c416b3575.pdfIn PDF document text
    • http://siondez.ru/lutofevagutawatusazalqtb4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5fe2979bd462e.pdfIn PDF document text
    • http://okstore.info/supexigutcg9s.pdfIn PDF document text
    • http://bifixofunoxov.iblogger.org/piwerawonijizuzizu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_6005e98bd818c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410730/normal_5fdffb64b4c35.pdfIn PDF document text
    • http://salonhq.xyz/mastika_hadith_jilid_3an25f.pdfIn PDF document text
    • http://prostotit.site/47403717401f8d23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://monepakixotimap.rf.gd/nifajugefomiva.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/rekojivuxivovafemegifiras.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/zonasow.pdfIn PDF document text
    • http://delomubabobuzu.epizy.com/woxasapipisameratesurodaz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 5844 bytes
SHA-256: c6d7beec8d69d9f7e5f11535b226f93c13c97ff46321dc21a62782b8bf5c747a
font_01_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 10124 bytes
SHA-256: c414561e6fda3272d2bf09e53f8210fb29da0617b339efb17bc31d37b744577d
font_02_sfnt_off00012f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 22492 bytes
SHA-256: f933fe720fd24ebbfc01ad1c518dd28368992bdcc62e1b7ddf5cf3ad1983417e

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