Malicious PDF — malware analysis report

Static analysis result for SHA-256 56df58248cc9af61…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 21:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4e820063077fc3c5d915bd6e7b5d1c0 SHA-1: f8d14af592c035bee39a6ae993f011ff2c99aedc SHA-256: 56df58248cc9af61f80b71af54ecd3e5d30d60fbedb02d683775af4f42c4997d
146 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external PDF files hosted on potentially disposable domains. One URL points to a raw IP address, which is a common tactic for phishing or malware distribution. The document body is unreadable, but the heuristics strongly suggest a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mail-ex.net/userfiles/file/38290759718.pdf In PDF document text
    • http://royalrep.com/userfiles/files/bufikenebat.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/67344221210.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/75705431988.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/81021551114.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/29029518128.pdfPDF link annotation
    • http://smingames.com/ckfinder/files/57018794526.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61331052a2b7c.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/jezop.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/senajitukedeloruxiwirif.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/rigabelinugejogizafi.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/5867369957.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/fixokib.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/xufazamekotamej.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/68572115173.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/71102484794.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210912_153311.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/724950332.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/47852093870.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/3288569831.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/godasizomid.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/21900226897.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/89014995874.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/figujemosawifetuximelitid.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/75719874440.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614594f22a32c---5789236129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=samsung+galaxy+emulator+android+studioPDF 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_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 16764 bytes
SHA-256: e9369f3ccb5b83e7240c183f27360412f4ce975f2aee2df6cdf94ac922923ac6
font_02_sfnt_off00013061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 10984 bytes
SHA-256: d935ddc337dab1c8c77f5ea5518ab0d42aa668340b6d7844f2121f5ac63717ae