Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2377e9c0e920234…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 05:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8027181fd689cde14aa283c972b13a72 SHA-1: 80fec731a23b57ecfd5b4d10338907c446f4a8a4 SHA-256: d2377e9c0e920234b313e1eba218e60d2fd2384129cb1210db730417a829deda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to disposable domains, a common tactic for link farms used in phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to malicious content.

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 https://uudanbury.life/files/file/rurixirowozawufuxe.pdf In PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/73311726975.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/30ea1a9e53f9464e53cb22a1d8c6c34b.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/zagozaxajuk.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d5a806b5740cc12c9452268a6cdc2ba/50484668220.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/negovuj.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/fugagimagikuxuma.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/masujumesedisesiwe.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/31221831621.pdfIn PDF document text
    • http://parentini.it/userfiles/files/fegixefevowowefa.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/69568737170.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/refipalefukemi.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/zuled.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/92191514773.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/ganopagesazapasupepode.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/11085cd714cd32eaef4c6a1d3ede4531/76636495879.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/63439711284.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/2821757193.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/nominomiji.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/56206163651.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/xexetan.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/64249178092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+set+auto+text+reply+on+androidPDF 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_off0000ad23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD23 16128 bytes
SHA-256: 9331f7a19edb890ec2004f325ad046a385221486c131272d25f558fa07e17710
font_01_sfnt_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 10780 bytes
SHA-256: 4b18644d73617572a686ec5954f80b55c929ead19642951dd4b421a70ea773f6

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