Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c2adf3b466697b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 23:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 24fedddd10e262702ff2a0e78b8d950d SHA-1: c067c9a2dd305902cbe0393e8365ed7dcd89aaa7 SHA-256: 75c2adf3b466697b5385a2382fd5c16c13614a8d8224cd7b49be8c344d903325
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://steakclubhn.com/campannas/file/78306313450.pdf In PDF document text
    • https://aartipalette.com/userfiles/file/96186761046.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/gapazetavugezinesoz.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/norur.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/7379117431.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/majotoji.pdfIn PDF document text
    • http://dentistturkey.com/image/files/8850205244.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/xulizalusugakuzosipalon.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/87521535481.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/25716004148.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/5273317700.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/86021592588.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/zigatonezugedilifuf.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/kazoridesodoze.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/nifotosotojibadinufak.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/sapifamedopoduvozafaxejos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b220ddabab---64280617152.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/velavinudi.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/84552108790.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/2076294238.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/92810242665.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/zubixuxedenulamazugama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=transfer+music+from+iphone+to+android+wirelessPDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 17596 bytes
SHA-256: d1158b8410434184cb0f7b21d6616844a65805ef390e0101d7beaacb613b4a91
font_01_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 11036 bytes
SHA-256: 8a6133fbb6d21c290a39ec14e422d5964d4134f9965701902dcc6a8ab9e06e66