Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3adfef0dfec593…

MALICIOUS

PDF

74.6 KB Created: 2021-03-11 21:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f3ffcf6ed9d39ff290bd88e3ada83ec5 SHA-1: 98882fb1544406dcd3ebf07132c373f20c62f612 SHA-256: 2f3adfef0dfec5930122f21fd906b7565cca5cc08469344f26ccfa8a4e44fedb
286 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. It contains a link farm with multiple URLs, including one impersonating Outlook, suggesting a credential phishing attempt. The document also mentions password protection for an archive, a common tactic to bypass gateway security, and the presence of embedded JavaScript implies it may download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://geguwuwivoloko.weebly.com/uploads/1/3/1/6/131636947/luxivezalug.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/wix?keyword=hot+hotmail+outlook PDF link annotation
    • http://specrazreshenie.com/ethical_issues_in_psychological_testingr19cg.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/puziwurumuwe.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/sopofutu.pdfIn PDF document text
    • https://geguwuwivoloko.weebly.com/uploads/1/3/1/6/131636947/luxivezalug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418970/normal_5fc598e582e9c.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/491920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_60336de93e505.pdfIn PDF document text
    • https://jovawovifo.weebly.com/uploads/1/3/4/8/134883275/9677269.pdfIn PDF document text
    • http://vvinorama.website/74677614941bj6xq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369648/normal_5feebe2c235fe.pdfIn PDF document text
    • http://psychologyrelax.xyz/fingerstyle_guitar_free_downloadshxhxz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_f3ba7efe49a34ad8ba05a87983a32852.pdf?index=trueIn PDF document text
    • http://pekamidakoj.atwebpages.com/widikutiwoziribejagix.pdfIn PDF document text
    • http://bememikat.onlinewebshop.net/vuxidobijipibuwewurebu.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/bryant_programmable_thermostat_battery.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/logitech_k800_wireless_illuminated_keyboard_2.40ghz_wireless_operating_frequency_black.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_3eede81c545d4861b5c058bad074598f.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_99a2211c9a974c22ae6dea01dfa08932.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_0ad0cccc675e4b3d872a58f953a270f4.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 4676 bytes
SHA-256: e1fc1f9e1952365df7e81ddd87d2f3cf42ffb1591af90ce5e342c8bad61f5500
font_01_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 10920 bytes
SHA-256: 90e640603b83b7a2484b398766062024b4b702bd4ad305e5b3b7a4b3a971193f

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