Malicious PDF — malware analysis report

Static analysis result for SHA-256 da553e768cbbe4ef…

MALICIOUS

PDF

132.3 KB Created: 2021-03-23 22:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5f159b24f8263d71cf2bf465fc5f5fef SHA-1: 3333dc12c9e74734913dd04a347eb016757d4a8a SHA-256: da553e768cbbe4ef368abd6af70ae9d25feb1f8379d27af2d253efc1d042aae1
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'gimoguvi.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, contains keywords related to 'morris cerullo biography pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitated the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=morris+cerullo+biography+pdf PDF link annotation
    • https://cdn.sqhk.co/kesusevuzep/jgjdhi3/44713938212.pdfIn PDF document text
    • http://twirlini.com/centerpoint_4x32_scope_focusfuy12.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/avFqfzs/60785633757.pdfIn PDF document text
    • http://fitokaps.xyz/sovimutiruvuroxunoxewb9tl.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/haieghe/mixufobu.pdfIn PDF document text
    • http://wapurejav.22web.org/rawazubisizawomiweb.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/DjdYLoo/nut_and_bolt_shop_melton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_602f7f973d995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_5ff6a88146e2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_95b0f762985b44eb9331d67277700cb2.pdf?index=trueIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_4f09df02c1c94e6f96a9fa2501c32f6a.pdf?index=trueIn PDF document text
    • http://xepalufozakot.epizy.com/microsoft_excel_formulas_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/lol_mobile_wild_rift.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/ireland_company_registration_number_format.pdfIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_95ea0f3e430344a38b809f6e2adba6e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/81122753587.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/17127205978.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_off0001becb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BECB 5664 bytes
SHA-256: 04f7749b72066646f14228da550fe9056f3888180c0eb3b1fa2cabff35f3d67c
font_01_sfnt_off0001d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D21B 15644 bytes
SHA-256: 40b1fd9d2376da4dc367b3b34f5cf7c12887c5246631bfb785165537a8fb9f6f

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