Malicious PDF — malware analysis report

Static analysis result for SHA-256 114b3733aaf2380c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 00:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f18195c4e9c589f77d030c0d96209ded SHA-1: a1f0a0ac2d9bccdab87e084b36e4465c1cccd03d SHA-256: 114b3733aaf2380c13b66016e4ca79dd95e87ed9765a3a7a7fccb91992a7ad5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://leylasuren.com/images/userfiles/imagefile/1707861182.pdf In PDF document text
    • http://maymaygiaydachidang.com/upload/files/nomobujoxifupu.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/27999908810.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/92889790726.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/33114653465.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/63664923584.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/61905140151.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/sobijavameguredonokuzegi.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/64612379208.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/12892895685.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161391c2e5a95e---kegunojogekotukexe.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/livipisibuses.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/1923553646.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/gefarilametibizogikaxe.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/76257177963.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/9740726041.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/solinekusizajuse.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/zasebuf.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/vaminozubonigarepa.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/79097898775.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e20a3ee4---92640295128.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/983419018.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/vadixeda.pdfIn PDF document text
    • http://wami.cc/data/files/kifirekada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+check+android+systemPDF link annotation
    • https://mediaget.com/userfiles/files/degilidumo.pdfIn PDF document text
    • 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_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 10872 bytes
SHA-256: b89a41941c35da9c05ca6065a4cd6e644a209d18050e54cd6449351d7180fe6b
font_02_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 16968 bytes
SHA-256: 39da7e20ccb2d43c10cf6a63ea4514a524fd883bc56a5da2ed3b7267f083776f