Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5c224754b375c6…

MALICIOUS

PDF

78.9 KB Created: 2021-05-11 07:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 162788aa26b75fb2e86da597a6a7de41 SHA-1: 74046172844a0b32c5499bfef0b4b0bfc4d69a88 SHA-256: 1f5c224754b375c6cf2c825bb0e137e2dee952d0e254f87a1a33dc72bbe29cae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=complex+numbers+worksheet+class+11 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421477/normal_6002edc11a6e1.pdfIn PDF document text
    • http://gapewikegolunop.iblogger.org/82875628189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_60541a9fcb13d.pdfIn PDF document text
    • http://discovljzg.fun/current_93_the_cloud_of_unknowing_lyricswlcv2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_6048ec3789bfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5fec69bfbb6ec.pdfIn PDF document text
    • http://trysalon.xyz/374179419104adb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_d06140b10d734353aa83a49f38ad650d.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_86b27f19a19f4c9da08d50ef4b24ecbf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/35149152703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0acf5c-2b65-4cee-b584-04d409202026/cyberpowerpc_coupon_code_reddit_2020.pdfIn PDF document text
    • http://fegelefuxenitud.rf.gd/9106475965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57fe93df-a648-40d3-a8d2-961162e1c814/world_history_timeline_major_events.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ed41ca-b8c0-4ec5-bb11-bf763220a04b/34498723735.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/information_about_partial_solar_eclipse.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_dd436d8d15dd48088b379a767fe41da0.pdf?index=trueIn PDF document text
    • http://jemuxopirale.rf.gd/45805591337.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/wureberevenuwuximur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79dec9cf-7c59-42ad-a249-21feb58fe4d6/87076658894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea92202e-946d-4ae6-9e7b-ecc61a247b8e/97176031588.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_331ee19177b14cf39c27c2c5ac5ce09d.pdf?index=trueIn 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_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5496 bytes
SHA-256: 5d61ea1690382b98c875daea5d2d1cabfdd9cd5741df0edaef7d440d6c44987b
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 11588 bytes
SHA-256: 13b078887241190dc71ac4f99409ed4e7d59debb5b5e1ae3972168038034b2a1

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