Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2054bddb0ba2f7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 23:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbcf52c48aa55da1f2f876890e60aca1 SHA-1: f5d5a31b8f90f677693e0b6e0a75c4743774685a SHA-256: 3f2054bddb0ba2f7f4ba710863223277cefb87a656a6f52e4e2fca476fafd72f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the PDF is designed to lead users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://blekinge.boj.se/uploads/userfiles/files/55539804085.pdf In PDF document text
    • http://antichigelsi.it/userfiles/files/44470309313.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/11628043274.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/031354509103.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_07_06_30_12_1879.pdfIn PDF document text
    • https://theurbanthinktank.com/files/zujubikoboliruzan.pdfIn PDF document text
    • http://acril.ru/ufiles/files/95242110787.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nasolotegobiwovapik.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/baxasa.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/23129613246.pdfIn PDF document text
    • http://chinazzjx.com/d/files/bupijafatamupefirokofewu.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/guranokedubojirugerasuni.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8be67ba9a8617e6a6d2490c8b52fc35a/ralavedaf.pdfIn PDF document text
    • http://telecycling.org/files/file/lililorala.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/nezopavavukedoral.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/42003471742.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/96825836206.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/pefotezuxunupi.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7f87645d---22065169696.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/71170055429.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/8607785646.pdfIn PDF document text
    • https://mbbs.hr/files/14275503056.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/varerovufojuxew.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109122245173316.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/73719006618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+to+word+converter+free+download+for+android+phonePDF 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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 10704 bytes
SHA-256: 4023b4a7547ab636757e37a4766fbb41f6608db3203e5f869398acdb150c43bd
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 17480 bytes
SHA-256: ae8a434bcf9d166bf66d940d480a8137a720f316b50c732fe8c39c2a16f9777e
font_02_sfnt_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1