Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9df7214e8f7898c…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 04:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c81208faa45a18766708c3da38c0af4 SHA-1: ed99ae7eff6b94ca9f6ccb24987cfe4ce7775609 SHA-256: e9df7214e8f7898cbc2553491ec115f7da778331fc1e60292a4f1a2322a74b72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a Google feedproxy URL with a suspicious query parameter related to free software keys. The document body is heavily obfuscated, preventing a clear understanding of its direct actions, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sakurahoaanhdao.com/webroot/img/files/xivutuweluzigudigom.pdf In PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/tupozipoziwokefilolejal.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/84677440533.pdfIn PDF document text
    • https://uudanbury.life/files/file/fopexerofo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/vetojeduzepen.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/60434074855.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/pesuduzonupizigoxa.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/lidofoxewibij.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/vodimagatebefej.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/sskb0hsf1obakprm09vcbievif/80770427181.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/40539085884.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/wubedi.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/dubokilureguzidoko.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/59232208853.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/25167345237.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/64446897875.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/bakiko.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/xamopuni.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/afeae69b93dcebc73de3e9933377b615/41477405817.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/62917541835.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/40019867669.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/76291995605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=office+365+product+key+free+windows+10PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1F 14656 bytes
SHA-256: 6d09a98a849116af3ac1af5334df46a3d7a6ff1d07eb1d255765db2d9850d5c1
font_01_sfnt_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 11468 bytes
SHA-256: 4dd829b8f4f6f0121bf380166c52f22f7ad702d63283af996db216491b0ba512

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