Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4415b3ac8252ee…

MALICIOUS

PDF

96.2 KB Created: 2021-03-27 22:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 52c8dec8d82c55507e84383908782c11 SHA-1: 50a5eb3f22cf0cd215704876df2b41d2ebb0e795 SHA-256: bd4415b3ac8252ee43a8a01e9ede800df9c53bfb26d6293c241407e50f3c86b2
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of malicious links suggests an attempt to lure the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=tanatolog%25C3%25ADa+libros+pdf In PDF document text
    • https://cdn.sqhk.co/gulizate/fxTck6C/49991953526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_602fc0957ee85.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/W4VQibD/worksheet_human_body_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379959/normal_5fde563963d42.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/j5jfmfp/33011233221.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/kHFhpy5/afl_season_fixture.pdfIn PDF document text
    • https://cdn.sqhk.co/wumerelup/Qjbuijd/xuduzojipuveped.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bazimiguzanuv.rf.gd/capacitor_voltage_transformer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcb0aa0-6363-464b-8c68-aeb1bf2fb69e/watsons_go_to_birmingham_chapter_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190394f1-48aa-4206-b42e-f47932ed46a2/how_many_calories_in_taco_bell_crunchy_beef_taco.pdfIn PDF document text
    • http://ragujaje.rf.gd/lesajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf41eb78-c9c0-4308-ad7a-a2d9c6559e4b/wuwinobokiruwarik.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/demonstrative_adjectives_worksheets_for_grade_4.pdfIn PDF document text
    • http://zifunugol.epizy.com/asymptomatic_bacteriuria_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/collision_reporting_center_london_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/tosomumav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10310a99-58bf-44ad-8597-ed51425dade6/74241844285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6890d6-0b94-48e3-b4aa-d17b560a1e2c/xidaneralosidibitaxaje.pdfIn PDF document text
    • http://dimegebewode.epizy.com/android_auto_2._8_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/arya_2_songs_telugu_songs.pdfIn PDF document text
    • http://gatapin.rf.gd/nunoruliwodomefidemi.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_off0001366d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 5352 bytes
SHA-256: fa6d0aad034c60ba73d642dfa42fc7837757fbfb689e3ed164de2e8cb522b391
font_01_sfnt_off000148a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A8 12276 bytes
SHA-256: f183b802dc408dbf70d84c0916eb45a9289b87ebf55abf43b492043524468e67

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