Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70bbe4f2278de41…

MALICIOUS

PDF

81.0 KB Created: 2021-02-04 16:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: adeb55bf7e97d495ae61183458a0818a SHA-1: 084ce1bfb29a2178d5da8a45393367d74505a173 SHA-256: e70bbe4f2278de41695c384e97c7d7ee68564a6cedeaf14b2d32dee48eba180d
126 Risk Score

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 0.9990

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://bologen.ru/aws?utm_term=whatsapp+plus+2019+uptodown PDF link annotation
    • http://begemotiks.space/796235450515nv6k.pdfIn PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/pojof_fabanob_duzes.pdfIn PDF document text
    • http://airet.space/92044644943cdf7u.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/9160348.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/ggijbJV/skrill_rapid_transfer_fee.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/1167599.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/guTseij/flight_delayed_due_to_air_traffic_control_compensation.pdfIn PDF document text
    • http://wide-mean.top/535046312085a3te.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/jfjdMgJ/99_impostors_1_crewmate.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/pukaridimupo/94379703234.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 5536 bytes
SHA-256: b945bc728dc54c3db500f2b66c1e03b1d4bc4732f36915c674f82a1d97bd3834
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 1932 bytes
SHA-256: 39330ed8423990a2d20423238ca7e853f83bb3385386a7ba3cedc5b4ca46caa6
font_02_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 10488 bytes
SHA-256: 191735b1ee849b459a54f175bb98a74f19d9087d410888ba50a1c152c0cf8cab
font_03_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b

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