Malicious PDF — malware analysis report

Static analysis result for SHA-256 df767654b5784554…

MALICIOUS

PDF

75.5 KB Created: 2021-03-19 18:34:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b74e57d3037ac7cd1caac5d4ade5d4e5 SHA-1: 99d0740ca93185da35d671163c63cf672f582847 SHA-256: df767654b57845547bc8ae0466adf69b5b7df3cfb914ebe4065aef49980cf159
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting it is part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lure users to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=hebrew+alphabet+flash+cards+pdf
    • http://domainlimax.xyz/samsung_un32j5205afxza_specsag0l8.pdf
    • http://logoped-samara.ru/netgear_wndr3700_access_point_mode1ji45.pdf
    • http://lisolu.org/7800907364116ao5.pdf
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/fumafo_felekexufe_vijuwo.pdf
    • https://sowupetu.weebly.com/uploads/1/3/0/7/130739285/42128c544a8.pdf
    • https://cdn.sqhk.co/sifalavuxozo/jgTjhvx/wifi_software_for_windows_7_free_download.pdf
    • https://cdn.sqhk.co/pevizopubok/kjehere/40370130520.pdf
    • http://ital-girl.space/avery_label_design_softwareoh462.pdf
    • http://feedbacrnz.space/50799775410cf6kv.pdf
    • http://tdsevsvet.ru/2001_lexus_es300_headlight_not_workingit4sc.pdf
    • http://metryck.info/international_human_resource_management_book_by_aswathappa_free_downloadt5itn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_e569fdbcd3664005b6bd05ac48491577.pdf?index=true
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_312a52aef3f94ea3aa355f57d3ab082a.pdf?index=true
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_3eebd83249844a6d9ddf48d81ee97428.pdf?index=true
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_3bb9c41f13a74059835838f084ecb3b4.pdf?index=true
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_fa0fba75dac24bdb9a812667110bf495.pdf?index=true
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_7e991030d85b4cdd80ed6da011203ef8.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_e5dc75958b0248589c24b95e11976315.pdf?index=true
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_1f6a045a964e4b4db7006f02a20e5ef7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24f.bin
763d65c906fcd87df3f7885679a451e3528c5cd4afa74e333e8cc4c08089cec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 5436 bytes
font_01_sfnt_off0000f4d1.bin
183822f1f48f5d82279f7a1f6ee26094b712158d424101a965aa2cf340d4167c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 12764 bytes

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