Malicious PDF — malware analysis report

Static analysis result for SHA-256 be26c861f3b31341…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 03:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e75b503dffa9fce9f69cc28f2750dc7 SHA-1: 50023d92362c2e8ab52d86edb740fc02f1279ccc SHA-256: be26c861f3b31341b4b58de835ff13c2786b0c5c5cc112525390b06becb0a295
134 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. It exhibits characteristics of a phishing lure, including a deceptive download button and a large number of embedded links, many of which point to unknown or potentially malicious domains. The PDF structure itself contains duplicate objects, which is a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vuonlan.vn/data/upload/files/kobupunufajepamewi.pdf In PDF document text
    • https://vicareyou.com/userfiles/file/26449475204.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/renibexevogi.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/buzikulijaxewive.pdfIn PDF document text
    • http://ativn.com/upload/file/begipavuvijome.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/riwopo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/21035350881.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/xikex.pdfIn PDF document text
    • https://actor-conseil.com/files/file/kovesipakuji.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/rogebigirabuxenokamonere.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/tonezamogefoj.pdfIn PDF document text
    • https://camelcarpet.org/d/files/pokagexukavugisodusa.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kafuxegebibasolopofipogaz.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/pigibarexegojivove.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/folatur.pdfIn PDF document text
    • http://iscelenie.info/files/file/kumozasuzumipemawu.pdfIn PDF document text
    • https://ms01bet.com/contents/files/kibemejavugufuwudipetula.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631498514.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2e862e5d5f12a9751f75a7bd04b9e654/jofixepanem.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/70215003950.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/38642804455.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-12/20210912055703868475.pdfIn PDF document text
    • https://datajournonepal.org/files/19116336900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pubg+pc+game+download+apkPDF 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_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 16304 bytes
SHA-256: dea882f23269fbbd6751c336bb434e94cf2924976d843b7feb69617e9e780024
font_01_sfnt_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 10816 bytes
SHA-256: b60670dbccf7c51cefd2263952938603d2d40cee4a42ebfcb2c5e40ad4219bdc

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