Malicious PDF — malware analysis report

Static analysis result for SHA-256 94511587a3c4d7d2…

MALICIOUS

PDF

79.3 KB Created: 2021-04-01 11:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0accf460cd354c16e023311e6e87fee4 SHA-1: 5f9fe261d7d74b58a481235581404e168db9abfd SHA-256: 94511587a3c4d7d2e5770d934cee967827f7465a46f81bd8d0553805ba672d1c
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/123?utm_term=carrier+command+gaea+mission+free'. This indicates the document's primary purpose is to lure the user to this external site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a phishing or malware delivery 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
  • 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/123?utm_term=carrier+command+gaea+mission+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_6023f260e89d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_604a10d8c27bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459621/normal_5feb756d94f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_603d987a79026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_6059fe0359cee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445343/normal_5fccbe4a7eef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_600ef45725337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5fe68da85e8a6.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/zuses/85101219236.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/gazer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e07f39c-2aaa-4285-bd83-635d31c324e6/what_is_the_best_forex_strategy_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be3e413-9bad-48f4-b6c7-d6dbd321f79b/gukuzuxopuzewuwomonawot.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/dewalt_jigsaw_blade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/free_vpn_unblocked_at_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1643c3f4-ef61-4f28-9a9e-195492e28353/the_exorcist_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/what_are_the_origins_of_the_us_constitution.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/femuxug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02af757-eecd-4806-8b65-100e2cdb94ee/wokotugupawagekeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc8b948-3a0a-47f7-ad84-b2bd0307d2d4/24978548000.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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5040 bytes
SHA-256: 284c5709e4dd0ded2eaeb36f57be5bcbb8cca1a6011b30f9ac9d463e63036f94
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 11292 bytes
SHA-256: a26432f6a04647300c2ea783dc04b3033a1d1817e1056c14e4d6f1ef42806437
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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