Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de4fc7b4fb5ab76…

MALICIOUS

PDF

78.5 KB Created: 2021-05-31 19:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2144b70074f71b7e4d7b53220335890a SHA-1: 39f4748f7a14f4dea13a45f71284bd67f5a98396 SHA-256: 2de4fc7b4fb5ab76142d7a2c25a0cfd44121cedca0e1c0eb7ee263c42a5e60e8
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'pharmacy mcq questions and answers pdf download', suggesting a lure to a malicious URL for phishing or malware delivery.

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
  • 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.
  • 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://allytemp.ru/pbw?utm_term=d+pharmacy+mcq+questions+and+answers+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fdc9a1f74695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_6055b4f2cd601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_600f5ad0d0853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_604d173415ba0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489977/normal_6009773458d15.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/5279680.pdfIn PDF document text
    • https://zinibikilejob.weebly.com/uploads/1/3/4/8/134886520/1563132.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144418056/zotetuxomozabonim.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144418539/2793751187.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/online_live_tv_software_free_download_for_pc.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/w/file/fetch/144418872/ibrahim_tatlises_mp3.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/indirect_object_pronoun_practice_spanish_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b897f29d-3048-45d0-89fc-668bbf3ccfd3/55045418860.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/brother_mfc-j5910dw_service_manual.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144415695/how_to_gain_weight_in_a_week.pdfIn PDF document text
    • http://lipadune.pbworks.com/w/file/fetch/144414747/gogizofe.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/47547658134.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/when_is_s9_plus_getting_android_10.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/why_is_my_direct_wire_smoke_detector_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8a9d05-10d7-435b-85e4-5336dc36201c/vimawulewikufebikagik.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_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 5712 bytes
SHA-256: 5cb00ca5ab7dff54d38e681461d38bb23fbe103f5b36f6e8ec8d5e921eb45ede
font_01_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 10576 bytes
SHA-256: 55a5ad09edf8c5da7bcbc3cdc6d986264947ace370062d1eae9c52d90285e897
font_02_sfnt_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 16080 bytes
SHA-256: bf2bb651642035a19e1b8bf5dc55c4db7948913289cd11d1f66f0c65c0fed8c7

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