Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdc9e884de2cb27…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 06:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d14f0b824ee55ffbe9c5d0d3662b36c8 SHA-1: f3232c656c178434e55ea9585e35616badcc3fec SHA-256: afdc9e884de2cb27ea7d7b49b022c46af4b0833b692daba5a4ba117a5f01dbf4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to phishing sites or malware downloads. The embedded URLs, despite one being marked benign, point to a pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310a0157b70---28197200955.pdf In PDF document text
    • http://hasdeu.md/data/userfiles/files/7600194646.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/54933086567.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/86379258419.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/dakuluwap.pdfIn PDF document text
    • http://zaiger.ru/img/file/nenawufexibomepesurobuvod.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/5244328093.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/11979455304.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/rebez.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/43505034049.pdfIn PDF document text
    • http://dezis.ru/uploads/files/81960522846.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021920210288231.pdfIn PDF document text
    • http://taigesw.com/upload/files/96645737188.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/galibexojagipiveroman.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/ladumanifekafeju.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/48460098649.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/lazukuvujuwivijof.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/tunotizu.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/pujilu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tunuzoxobupogijalef.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/dogabigonelozugukakajilar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=copy+my+data+app+android+to+iphonePDF 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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 10588 bytes
SHA-256: 876ba627de8f3e7c7d99453e3cd6d6122a756edaca3ae2971cb999aca7de9cb4
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 18556 bytes
SHA-256: 62759cdf7b077114b9560b561614adf4b1eec97d324992af988bb21881e3d469
font_02_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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