Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea34ef80e1835ec…

MALICIOUS

PDF

68.7 KB Created: 2021-09-11 19:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25a767c5312c9380cd63e049442ee28e SHA-1: a5f83accae9a754e24f483081e67a4cb27d1eb22 SHA-256: bea34ef80e1835eca71f8e2d7370fbb81d2f8c1dd99194189b86215e951baee3
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, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to a link farm, suggesting it's designed to redirect users to potentially harmful content. The presence of many distinct hosts and UTM parameters in the URLs further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tianlanip.com/filespath/files/20210902142156.pdf In PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/xevox.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/60039136605.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/mubupepitibodo.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/40781893943.pdfIn PDF document text
    • https://viettrungson.com/media/Files/59646998609.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/36220743409.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/rudibemaxigevebuva.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/32802231717.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/93526814800.pdfIn PDF document text
    • https://il-gusto.com/images/file/439042503.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92a5a7886---motoruwexi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee2a133d0---pebogibigorus.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/92737316522.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/92978627752.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/tizegavuxedirodigafisifix.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70931055751.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/68463007599.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/kitopinoriwubizomawivazoj.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/tunusofutexunowekivopid.pdfIn PDF document text
    • http://soles2walk.cz/data/file/62854332682.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/64421975469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+textview+buttonPDF 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_off0000b26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26F 14320 bytes
SHA-256: 6a8067e2ea72d30f531f61662609857e371e0d6e7b477ab027f4119743b09256
font_01_sfnt_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 10340 bytes
SHA-256: 1a05d7a1b69e7e6acfec44008d16d446a3f4947f3b522478589ca182f01954e9

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