Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9bb8df37599c9e…

MALICIOUS

PDF

73.8 KB Created: 2021-04-04 01:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4b91af6971c85b298ae16b1c92596686 SHA-1: 02493b4ee4f920b254bebcb74b640409014f8a0f SHA-256: 7e9bb8df37599c9e1cb10d342e593547f9407487a85ab28d0cbfe2cfde33fb55
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of external links, with one prominent URL pointing to 'zajinet.ru' disguised as a data analysis tutorial. The presence of embedded JavaScript, though not fully detailed, suggests potential for malicious actions beyond simple link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=r+data+analysis+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486552/normal_602b71b52afc8.pdfIn PDF document text
    • http://nuzanav.22web.org/am_pm_time_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/igiieib/download_aplikasi_easy_screen_recorder_laptop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_601fc4185f320.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/hf88jfr/craft_palace_pro.pdfIn PDF document text
    • http://lirerigoteses.22web.org/porter_cable_jetstream_air_compressor_4_gallon_manual.pdfIn PDF document text
    • http://fofitev.22web.org/100_common_chinese_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/jonuwezipagi/zjbgjhd/tusuxuramisiguzaxekowupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigidokolud.rf.gd/kolukelesamasi.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_7e2186f02d7842a6a3b90ee749ad4819.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/46944577329.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_5523f8afa9c5453b9a6ba8be144bfc49.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_53a4be959a0f4936bc9310b27eabe09c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/guidelines_for_issue_of_compulsorily_convertible_debentures.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/74683694712.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/martin_luther_king_jr_books_for_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/accordeur_guitare_acoustique_apk.pdfIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_c40bd0fcfd324c569fffd09056088926.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/31743480375.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/67149393389.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/61382314655.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 5144 bytes
SHA-256: 2f5fa1bd44eeca57c945408efbba6169e4c83a0fe5e535b0474fcc5fc1951e2b
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10628 bytes
SHA-256: b2aec17ebd12220a454d2d3c8ffd2dbb6bcecc0665b8bc47577fccac8d2bd5aa

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