Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dcf3052ef93873…

MALICIOUS

PDF

74.6 KB Created: 2021-06-13 02:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f29338ee2f058c86388a0029b2b355e7 SHA-1: e0cf257ff0c581be1153f9662f6f958e214e1a93 SHA-256: 91dcf3052ef9387322aca8cd68b2d87c0ca5b645fd1d28fdbfa02e76d23bde29
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

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://smidgel.ru/pbw?utm_term=100+v1+v2+v3+verbs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479446/normal_6044d529ac3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_606e7bdaab374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384029/normal_5ff8b54120603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473419/normal_6058c766b617b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_5fd7b15e7f79f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_6023b5a549916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421213/normal_5fc56db378d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_606108e8d618f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_604fe43960f18.pdfIn PDF document text
    • https://englishgrammarhere.com/verbs/100-verb-forIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d5180f-e9de-475a-bde7-fa424a2a752b/best_penny_stock_watchlist.pdfIn PDF document text
    • http://zalemofe.pbworks.com/f/tlcharger_dragon_ball_z_shin_budokai_5_psp_iso.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/145052415/42330412252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54cb38b7-b8e2-47b5-9c26-c7e6f0fe02cc/36184842384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2bd0d6-1a7c-44d3-a050-7f357b62f563/5690945752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545ea739-5904-41de-83cd-26e4eafdb72d/38378885607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c1775c-3b64-4fb4-8251-679f6b2a55c8/how_to_change_battery_in_logitech_wireless_keyboard_k345.pdfIn PDF document text
    • http://zanuraj.pbworks.com/f/36209768936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d338caa-57da-4f23-b9e9-b6553f20ddde/58074776942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33abb56-c73f-4825-b476-7a5a5c594b1d/chemistry_shapes_of_molecules_questions.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5032 bytes
SHA-256: 49a7623aead88fed0c944307573c4238efe3803c3b684fa0ef09957eff71165e
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10656 bytes
SHA-256: d7a6bfcbb4b492cec54e55a9ce5e5734b27a0d0499d9faf32614ac779cc61400

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