Malicious PDF — malware analysis report

Static analysis result for SHA-256 090f4426f6fd7bd3…

MALICIOUS

PDF

82.6 KB Created: 2021-03-14 04:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f382a637c2d96ea0a5cccebf2ff91f66 SHA-1: 59c7e8016fe534c659d6ec6f8bdbe5e165d1e8c3 SHA-256: 090f4426f6fd7bd30b8f53665309c683aeea5a5eb675be2173e1bb9bac35b5fb
116 Risk Score

Malware Insights

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

The file was detected as a phishing/trojan PDF by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'synonyms dictionary'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ponafet.ru/123?utm_term=synonyms+dictionary+free++for+pc PDF link annotation
    • http://gnfcns.info/novexupebapuzudumurepa1686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_6039596970607.pdfIn PDF document text
    • http://rubisteq.online/the_hidden_staircase_booka1j13.pdfIn PDF document text
    • http://slampochka.ru/dalangt8vo.pdfIn PDF document text
    • http://springwin.space/36728073579hu148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_5fd191162ba3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_6009141b737d2.pdfIn PDF document text
    • http://bodyita.space/204564671981sla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_5fd1281b4cefe.pdfIn PDF document text
    • http://checkmyscore.info/33024237870grl4w.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/wunupalezozerud/kumpulan_cheat_minecraft_pe_android.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_9a83fc1db02948179b4ca45ca823d0a6.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_3aed25e7d5384109a05072aaeb10a8ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/free_ivy_leaf_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/free_inductive_reasoning_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/64997413576.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/24192684853.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_9840d5b542af4b8a9eb4eb6db7a19d50.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_66111e148d694946a9bc6aac35968ccb.pdf?index=trueIn 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_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 5472 bytes
SHA-256: 846e5fd67ff6a99b8b0d22e6bb93955561fcc4427a7fb62f942aba398cd65dc7
font_01_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 10908 bytes
SHA-256: b5d49273baf12119e96dfa8157691faed076222de3bf58be5a4e1f0b3a52758a

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