Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b44cafe9455b5a1…

MALICIOUS

PDF

70.4 KB Created: 2020-11-10 11:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c3f3b692ab88b1ac1beb49c3f5f185d2 SHA-1: 369496e9b447811f322c7f0cb13476f513772b25 SHA-256: 4b44cafe9455b5a1d74ffad13a2c68fea2df133f57da30f4a7828ba48368b307
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URL pointing to a phishing site, disguised as a free inspection form. No scripts were extracted, but the PDF structure and embedded URI heuristic indicate a phishing attempt.

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://traffset.ru/strik?keyword=dot+inspection+forms+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fa2158834b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_5f94c233a0c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5fa61b39cb5a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5fa7f359853d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5f9c9e07394fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426260/normal_5fa8471d60abe.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
    • https://s3.amazonaws.com/wivunonovef/el_dorado_springs_r-ii_school_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bffb20c2-16c8-479d-b368-d461303a1e70/34104671694.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/jipizukazot.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/letadakitewelazuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/worksheets_on_prefixes_un_and_dis.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/fortress_safe_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/71393924937.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/biparental_inheritance_of_mitochondrial_dna_in_humans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e91921c-045d-468a-b1ac-9d950ba31c2b/lupejimenifawadevasulurux.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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 4708 bytes
SHA-256: a4294276535ac5268c7dc9d9a369e591982ea931ffd0d0f47a446c1c9a0bb484
font_01_sfnt_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 10680 bytes
SHA-256: 07403038b1741a3f0a9dc34cd9f488dc3117542b8a3774cdb8580aa36d537e9d
font_02_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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