Malicious PDF — malware analysis report

Static analysis result for SHA-256 288c26a5fc778604…

MALICIOUS

PDF

78.6 KB Created: 2021-10-07 11:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ee207bfb1389d5614114524a0b237ab7 SHA-1: 673f806e27ab9bb7e6087ee9fffcf747d14d4688 SHA-256: 288c26a5fc77860406f9323e9b9c170aebd5cbca22902aee1f6933ad67900ba6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to external, potentially malicious, links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://yuemeism.com/uploadfiles/files/45928806555.pdf In PDF document text
    • https://aglogistics-bo.net/userfiles/file/verulorijufoguzute.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/5445100076.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/kedubunizedewodevepiw.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/64150780001.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/rimorajebinedomovapo.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/nuburolorobenele.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/46059676362.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/10909069557.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/71272140546.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/mevasuwesupibezewotebama.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/37314944779.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/77524325391.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/54150520754.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/97620340522.pdfIn PDF document text
    • http://insei.eu/userfiles/files/30318391885.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/11809582168.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/81591893140.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/vujof.pdfIn PDF document text
    • https://tarsiman.ee/files/file/9694758196.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/tikakubelusupok.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/rawetilobovi.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/lelakusujezemezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=stay+with+me+slow+remixPDF 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_off0000c12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12B 23036 bytes
SHA-256: 10aae083e94dc791ea7f5035d8b9c7f63540cf0ef42860ae7920af4c304c2dba
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 10648 bytes
SHA-256: a6a7d5680db7c5a11a04c2efc393b413c382fb893c0b3e6d6943e703f6abc466