Malicious PDF — malware analysis report

Static analysis result for SHA-256 f076c71e0821f302…

MALICIOUS

PDF

68.0 KB Created: 2021-10-03 20:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ba1731c52465122376ce800f58f0cd13 SHA-1: 6030510974a2f9d5eccdd753f2d8008927ea01a1 SHA-256: f076c71e0821f302a48ac8b2b0cba37677d74bfee9857a40da8bada8b8183928
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including a small file size and an image-based presentation suggesting a screenshot. It contains numerous external links, many hosted on potentially disposable domains, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://firsatpin.com/calisma2/files/uploads/jitikowenu.pdf In PDF document text
    • https://soalmatematik.com/userfiles/file/52710597333.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/17814128930.pdfIn PDF document text
    • https://tomas-music.com/contents/files/riwegi.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/xarizubudumixetozazovu.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/50122206066.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/tetexuvifitopanuvujob.pdfIn PDF document text
    • http://sivam.pl/files/file/nalepejofur.pdfIn PDF document text
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/dosugiseva.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/giwogoxiziw.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/kawidopukopilof.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/pivusuganafaforitovijawoj.pdfIn PDF document text
    • http://lg-palette.com/upload/files/ritamofalabuwexerapimivo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/dec1c7418b3190dfecb52857200a6c8e/72574606833.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/11468774235.pdfIn PDF document text
    • http://355353.ru/userfiles/file/nuxew.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/radunividulovutevuw.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/givugibutatakavulekekuge.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210923231051.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/vutujuradexokoge.pdfIn PDF document text
    • https://12shio4.com/contents/files/daziwufivoxejawinuk.pdfIn PDF document text
    • http://livestocktool.com/d/files/mutabovozebutibonuvofusid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=why+did+church+leaders+and+wealthy+merchants+support+the+artsPDF 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_off0000ace1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 11072 bytes
SHA-256: 1ada5394f4f1d648ca6e97b70056320df8a5092aecbb93a8cd8d2977de5aa062
font_02_sfnt_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 14432 bytes
SHA-256: e0e7187c466adb96e429337cb0a1d8ba562726e0d0d9c6b8f291e72e898a52ba