Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40392c3371082c3…

MALICIOUS

PDF

78.8 KB Created: 2021-03-15 14:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d3c303fc6651a8ea835f62d0600e295d SHA-1: 35c4fb22d5cf0daf47d803c2091091175c276afc SHA-256: f40392c3371082c396d2c36e45eae58f50b3c8f63814ac4b5182f7203c60467d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru', suggesting a lure to a malicious site. The document's structure and the presence of multiple external links indicate it functions as a link farm, likely to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=hidden+figures+lesson+plans+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421478/normal_604aebd520185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450734/normal_600655689130a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470401/normal_5ff0296741162.pdfIn PDF document text
    • http://stikc.xyz/65434840405zgbnv.pdfIn PDF document text
    • http://cheatyou.site/40858357513zuc4n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5fc9f72e938cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454421/normal_601046969214f.pdfIn PDF document text
    • http://freshka.fun/sixeloxip2xrqw.pdfIn PDF document text
    • http://mebelintera.ru/21126171386gf5nk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5ff7fe21725d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_39f55010c95d4c7bbd48f4282b121196.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/netflix_crack_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6093ece8-43b6-4608-87a2-52982e416870/hr24-500_vs_hr24-200.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_b13e20c046bf4fda9fb75cdec73a089f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa8f803-8d5e-4666-9baa-00947d264c06/ussf_referee_grades.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/44220630608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a591450-7cb1-4c59-a6be-fd5a99f2bca6/33008068683.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_832f04de93f442408958c2adbcb7667c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5078332-4a99-41ee-a6be-3e8daccf69ee/budafunar.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_24f7c4bb3644431c8fbc490219fb7504.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_2502f50c6cd14dbd91e5c23fc7852727.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_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 5172 bytes
SHA-256: 9c4b040861ca801f236a1d0b915accf5011341f44619bd0c35309ac79eec4742
font_01_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 10332 bytes
SHA-256: 7987e84eeac71a82f20057f0b0cadeb361f1db8eeedfcc111e2c6ae03102d30c

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