Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d5f770e0549c03…

MALICIOUS

PDF

74.3 KB Created: 2020-12-29 23:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9001ab672c27b9cb5030c97b42176796 SHA-1: 1a114d869e28bda4953d05811c9a390e7f692d11 SHA-256: 52d5f770e0549c03ffc6c47c225edfe52cce4099c8d9ad12d90f2539f601006e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://trafficel.ru/wb?keyword=free%20offline%20vegas%20slots%20casinos%20chicken%20dinner%20ideas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421770/normal_5fe26acbe8d0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fcb481002993.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/846da237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fbea783b9c83.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/gaxabigenobu.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/tapexiw/stubborn_definition_synonyms.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/60956465644.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/3d_game_accelerator_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/dibenulemexuboregujaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8cb94bd-df7f-4c92-bb56-e3e89fc07203/77603468905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb06d3e5-80fb-4d94-81fb-561dafec3193/old_testament_study_guide_lds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524ed50d-2f28-4aab-be1a-7d8d0e7f135d/50_cal_sniper_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/44887295872.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/antiphospholipid_syndrome_pregnancy_guidelines_acog.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/sagufuwasatuditimokipu.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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 5148 bytes
SHA-256: 2a6e0e781ee91ac039f3500deb5d9a77a6e90ca721f38952a1e51458b7cb145d
font_01_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 11300 bytes
SHA-256: 1687a419c73138e4667167c9d4ac705922c6baab4949d34a30606d62b387a348
font_02_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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