Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eaa0a88a30e6c52…

MALICIOUS

PDF

84.3 KB Created: 2021-10-10 11:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cd9d603586561eae3056e6abd301ce4c SHA-1: c07dc4a4d2bba13eec91b6e4192c05e7d6228568 SHA-256: 7eaa0a88a30e6c52e48ad8c18bb6b4332e2b5f651a4978ed544654651465b0b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDFs hosted on potentially disposable domains, indicating a link farm or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to distribute links to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://centroolosprato.it/userfiles/files/80658852192.pdf In PDF document text
    • http://usarsenal.it/userfiles/files/3503541507.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/99448450754.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210919021802.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/bidosigobibabedapaxupob.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109291818177953.pdfIn PDF document text
    • http://na3.it/misc/file/vukopelura.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/23334448181.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/89150362071.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f0cb3781---sisuvo.pdfIn PDF document text
    • https://diphong.com/uploads/16610877930.pdfIn PDF document text
    • http://podarox.ru/public/files/91082919068.pdfIn PDF document text
    • http://www.puhito.hu/uploads/dufusipukeluxumomekadipa.pdfIn PDF document text
    • https://aaaxxion.info/images/file/43121950520.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/tekewurefozadoxesaba.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/nejomevifuraxu.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/lamemumikozanimiw.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/28174203088.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/10983672879.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0u7rrb1vflfsibbneoofqn0efh/moletamunasuvoxigejoz.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/mijebujakus.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/dozoxiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=new+learners+english+grammar+and+composition+class+5+solutionsPDF 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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 11256 bytes
SHA-256: 83982f61ae2c1d5db721a116a188b0bb356c508abd741b3809662a0534b4fbad
font_02_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 19516 bytes
SHA-256: b213cc7473455e7338b78f28f79e5fc4bca3d44296ba99aab7294a77876fe31a

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