Malicious PDF — malware analysis report

Static analysis result for SHA-256 d226b439ed846b39…

MALICIOUS

PDF

96.6 KB Created: 2021-02-16 13:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4051a4f2f0ef6b0f1c1cae0a086d9b6c SHA-1: ab43701d38c403fcaee7b5d09b118445ba6e69c0 SHA-256: d226b439ed846b396314cb909d00348c1fcd28f6b76baa900fa12bcb617eb282
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/wix?keyword=so+yi+jung+drama+list'. Additionally, ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier also flagged it with a high probability of being malicious. The presence of embedded URLs and the nature of the redirector suggest an attempt to lure users to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wix?keyword=so+yi+jung+drama+list In PDF document text
    • http://creditreportusa.info/disafejelagosikika4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_600fe17e4f7f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448558/normal_5ff7590b6f243.pdfIn PDF document text
    • http://medicalpracticementor.com/peoplesoft_purchasing_9.2_training_manual9oar5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366032/normal_60088a562bbac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_601086ec7e0c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5ff4676e6893f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_600f559560a01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_5fe42827e2ddc.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/igHhjjj/tasty_words_2_answers_level_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_5fe7889c06837.pdfIn PDF document text
    • http://salebox.shop/forming_compound_words_worksheet_grade_6cdvfj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_60236defc3ef9.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/baxekojojexusol/wawotafenevodalegujiw.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/org_chart_photoshop_template.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_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 26244 bytes
SHA-256: b23074d08a40298e8db1726104fd7aff093457ae6626b6eb19241481077a2bab
font_01_sfnt_off00013dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD6 5424 bytes
SHA-256: b2db113de4ba0a0798d884a903541f0e5041cfa38078c085a32061f0019e6ce6
font_02_sfnt_off0001503e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503E 10708 bytes
SHA-256: 828c38ebca253e9426b2dc2deee62f24a73a91975834def76bf1a10cb15e8bae

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