Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7724c3959394ff0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 15:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df0cb0a41b87c07deee2fc3ce1dd505a SHA-1: 8a53f18162c0869f509a11136be240e385e66420 SHA-256: f7724c3959394ff07e45d6ebfc2db2a1e0f0f336219408adb53837366fd6d00c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://allytemp.ru/uplcv?utm_term=thin+lens+focal+length PDF link annotation
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/posofobazanuwosav.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/68524027751.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109130324156748.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/52459526837.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/budegojepemerolomoga.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/zobajameredefokipape.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210915154306.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210916_D15B979F7DD453D2.pdfIn PDF document text
    • https://trainova.com/userfiles/file/jilusimu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/teridumup.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/semigiripumov.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210908_030901.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/fubekas.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/74334178207.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/16135967664.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/78440239484.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/ragonekesufijaxozi.pdfIn PDF document text
    • http://bienbao.net/uploads/files/sorerinirusevo.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910073507218408.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/28321168922.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/dopigusap.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/2861778031.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/wasotujoxudif.pdfIn PDF document text
    • http://altinay-law.com/images/file/voteku.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_off0000c4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 10476 bytes
SHA-256: 7318fac5128016714519c8d74d3f5b82955f984a05007d1c78a5deac193c81fa
font_01_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 16804 bytes
SHA-256: 71fac36a0c4e5bf7f553fe4c880655ac3b0976d9fdefca2184656676a1dce79a

Open this report in the interactive analyzer, or submit your own file for analysis.