Malicious PDF — malware analysis report

Static analysis result for SHA-256 821f4b967a150c02…

MALICIOUS

PDF

80.2 KB Created: 2021-03-04 13:36:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3dc99b8df66fc245374219a1e82f9263 SHA-1: 2f2ae191724eb6404d7faedb1d2c0cb6fb3ea771 SHA-256: 821f4b967a150c0250965f7800fbf4e8559a2876e7e1595b709b98ab3a01694f
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a phishing-related domain, disguised as a performance appraisal example. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall classification suggest the document is designed to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://zajinet.ru/award?keyword=what+should+i+write+in+performance+appraisal+example PDF link annotation
    • http://help-feedback-amzn8.xyz/kujixozakotekorepigazimolrih8n.pdfIn PDF document text
    • http://qqkaxes.xyz/esc_heart_failure_guidelines_201808lsw.pdfIn PDF document text
    • http://app-3null.com/hamilton_beach_flexbrew_2-way_coffee_maker_replacement_carafeo5umm.pdfIn PDF document text
    • http://normab-id.com/smash_4_sword_fighters9lmih.pdfIn PDF document text
    • http://mikrotikwizard.com/360_antivirus_app_laptop89rp6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601d26c734f99.pdfIn PDF document text
    • http://canonsburglake.org/romujezizofudalofirifomija8w1m.pdfIn PDF document text
    • http://buzovanukoziba.22web.org/69004461041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484635/normal_6016d4644d944.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486751/normal_5ff5b716f3859.pdfIn PDF document text
    • http://obmenkalnr.online/pulse_secure_desktop_client_5._3_release_notes94tg8.pdfIn PDF document text
    • http://vagesibakizame.iblogger.org/diamond_infinite_edge_or_sb-1.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/wunupalezozerud/kumpulan_cheat_minecraft_pe_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/16881620740.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/9035086003.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/magic_play_airplay_for_android_apk.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/66231200305.pdfIn PDF document text
    • http://pubexet.rf.gd/tezadazituritofebu.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/31022498205.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/mesopotamia_crossword_puzzle_clues_answers.pdfIn PDF document text
    • http://pawubiba.epizy.com/76412485822.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/witutivuxegabojukexeruku.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_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 5568 bytes
SHA-256: 4ff00708a68edc6de91a93b5fe8e1285bb418320db5225ecc6751b6ee219709f
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 10304 bytes
SHA-256: ab0138e853382be7a5a974e304597c5a2614609e316c05924d27411735d93951

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