Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f2681875d21eee…

MALICIOUS

PDF

75.6 KB Created: 2021-01-28 11:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2f97163328c6cbb5a00969678c18e66d SHA-1: 7642ca22419b72a7f71acc4d58824fb1a8848ef3 SHA-256: f0f2681875d21eee0dc0d9018543f17529298344f5a41a6e40b53d1de7826cd1
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Hooke's law practice problems with answers'. The presence of an external URI pointing to 'druttle.ru' strongly suggests this is a phishing or malware distribution attempt, likely leveraging the PDF as a lure for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=hooke%2527s+law+practice+problems+with+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5fe0497c3846b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375070/normal_5feb7b5e67fdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5fe3d796b1b8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465000/normal_5fec218bce8da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479237/normal_5fef1b89dce3f.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/jajdsmQ/72406557605.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoselubiki/PhgGTjd/45989065070.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/gchh677/ark_survival_evolved_ps4_xbox_one_cross_play.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd5eff0e9720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5ff2caa03144a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fewuzefar.rf.gd/21390740117.pdfIn PDF document text
    • http://merojupamen.epizy.com/lexisakovopo.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/11937927031.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/91356030172.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/christian_bible_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/microbial_biochemical_tests.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/arowana_fish_video_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 5252 bytes
SHA-256: 3dc2542a7e065b4d36574dcc3208c4054dd1f8b0f01e912d685d62ab30d0bccc
font_01_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 11376 bytes
SHA-256: 545d9f426c0a8d5d00f6f41282cf8862a33381961afd92ac35bd785363c6ee6b
font_02_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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