Malicious PDF — malware analysis report

Static analysis result for SHA-256 86012e6627abcfd8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 22:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b9c14ba5189ec9a33486344f0e44bad SHA-1: 5d9bb11032785f42ff5f892f534b9cb1aaf32950 SHA-256: 86012e6627abcfd8fbddf5bc51abd8e5b67ed02bb4851a15458d1cda5414ea82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 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://akproauto.com/nbloom/fckuploads/file/pulatidigebaxuzexaxiw.pdf In PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/60271491751.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/sebideremuzezosodiwepuwiw.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/viwer.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/52851230543.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/sokutero.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/sirudogumi.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/zogetokisukiti.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/47549291518.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/63070718134.pdfIn PDF document text
    • https://edex.co/userfiles/files/89403044649.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kidesegaguxig.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/38109344545.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/23532396301.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/9045924381.pdfIn PDF document text
    • http://kahasat.cz/data/file/36392376372.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79cce5473---4742887322.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/rupisimivexijefebolimogex.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/64275968301.pdfIn PDF document text
    • http://wirheiraten.de/images/file/komoludimitam.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/xibofi.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/bawaranozupafon.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/marinakadem.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c344e14cb---votatokosowuwazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+1+last+day+on+earthPDF 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_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 18380 bytes
SHA-256: 89828ccbb20221df71910a7ab022ae2548535998e1f82a1a21f3ae0c19212db2
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 10492 bytes
SHA-256: 89e789f7d7701536a80200dec283af19ef45f50a55d9bb0b33e88c76328fecf6

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