Malicious PDF — malware analysis report

Static analysis result for SHA-256 3581d7607fe6e6f7…

MALICIOUS

PDF

83.1 KB Created: 2021-03-19 12:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 844c508ccdc42d5cacb323450e16ad75 SHA-1: e7b5c358959d2eecb4ad9638f484c6e340f238d2 SHA-256: 3581d7607fe6e6f7af3d7ca7a02cb63fc163b2a6a8c7ea4fefd9baab9f24c7fc
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large PDF link farm. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=android+mvvm+architecture+components In PDF document text
    • https://kofekatemate.weebly.com/uploads/1/3/2/8/132815318/43b0f6b69d706a4.pdfIn PDF document text
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/8b0f21a2dd6ddb.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/economic_and_social_issues_in_advertising.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/42692688136.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/xogumafijotakofuxijojeju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369149/normal_5fe3da80cbf91.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/hxqjihI/samsung_galaxy_s8_plus_super_slow_motion.pdfIn PDF document text
    • https://marejeloxivel.weebly.com/uploads/1/3/4/7/134709382/zaxorukup.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/learn_basic_c_programming_language.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5fd06530f0904.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/YnTjahe/body_scanner_camera_for_android.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/zisulamisozoto/85355242201.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/butukuzinuwatu.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/47565574670.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/27728968156.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/cashflow_game_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/65334295812.pdfIn PDF document text
    • http://pajupevezujugut.atwebpages.com/auditoria_financeira_exercicios_resolvidos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 5328 bytes
SHA-256: 32364fcb58e6b5730ae284f953cfbec17f3610e6c918183a2fa7d7ebf07b86dc
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10944 bytes
SHA-256: dcfcb6b282c9a9adc708a4d4cb51bdaf1bcbddf39b0ceab0fd4a30481e1af224
font_02_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 16392 bytes
SHA-256: c9b9d40238817e9fd1c0b290bb100284b8f2d9dcc1188338581b9d27efa8fa30

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