Malicious PDF — malware analysis report

Static analysis result for SHA-256 483962a53764d4a4…

MALICIOUS

PDF

83.2 KB Created: 2021-02-14 02:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 310b3ba7f5767a24cf6b7dfb3fb31cbe SHA-1: 9c9cd9b4632b29b7b902bb182a5030065e1ed949 SHA-256: 483962a53764d4a479652b209a0c069e97dee85f8a425bc4447f6957b014053f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The presence of an external URI pointing to a suspicious domain, coupled with a heuristic for a download button lure, suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/123?utm_term=free+nba+jam+apk+for+android PDF link annotation
    • https://cdn.sqhk.co/wevubuse/ihajdA2/18501434012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_6002792f2aff6.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/bjigfYF/9290455376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409992/normal_5fcbe5ab1dd54.pdfIn PDF document text
    • http://tehnoprom.org/23177071537agnta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6026f9f1822dd.pdfIn PDF document text
    • http://sacredname.ru/binomial_expressions_in_englishc1kgo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_601cf914b963d.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/gumagabu/wevexewatupapozanugaxibid.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/15050938034.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/2351712133.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/dunixigodemo.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/wililugananelodiw.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/after_effects_video_editor_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/ruripon.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/piriformis_muscle_pain_stretches.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 5212 bytes
SHA-256: 4cf8849d6d398e8d224d3b30c3dbb4c3b8d06bf8b3aba98c0c819edce86531cf
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 10940 bytes
SHA-256: 624b286080110735545f4fa50be1e495934a8fb60a58d47172d7f4c15f9becc5
font_03_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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