Malicious PDF — malware analysis report

Static analysis result for SHA-256 4642085e6ccae946…

MALICIOUS

PDF

82.9 KB Created: 2021-05-06 02:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d5adaca24639eeb94c501f0b90d9ca52 SHA-1: ddaf893efdbf4337cd912d257d03d6b0774a07bc SHA-256: 4642085e6ccae946129a3f53a721b74ab71920a56dde8d51952b374842b5258e
134 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and potentially a phishing lure, with a high ML score and ClamAV detection confirming maliciousness. The embedded URLs, such as 'https://druttle.ru/strik?utm_term=how+to+convert+kindle+to+pdf', suggest a pretext for user interaction, likely leading to a download. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed to trick users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 https://druttle.ru/strik?utm_term=how+to+convert+kindle+to+pdf PDF link annotation
    • http://avto-document.site/cuentos_de_jorge_bucay_para_nios26m7e.pdfIn PDF document text
    • http://wordsideget.top/raise_your_glass_song_lyricsv2cqi.pdfIn PDF document text
    • http://j3vnci4.xyz/xepufewanawegonosumi3hrzp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_602eac1ed9179.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/iaAjrhe/free_homeschooling_resources_uk.pdfIn PDF document text
    • http://premiumpornclips.com/ritemesefevaloxenoweso511h1.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/best_book_for_stock_trading_redditg05l7.pdfIn PDF document text
    • http://trylait.club/which_word_belongs_in_the_circle_marked_1_historical_formal_biographical_poemyfcxt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_6010dc1272d17.pdfIn PDF document text
    • http://geesecam.com/teknetics_delta_4000_metal_detector_coilsvkql2.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/UgjbiaT/19677059502.pdfIn PDF document text
    • http://praktika-ingenieur.com/50348203743cds3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458856/normal_6000ca5beec5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_6010027e16d46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_cf87983e4e394b5e89a341c5b2b5cb4d.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_e2febded8c4a41719265b5e9188646d8.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_c76725c081db4faaaad8a211bac4f253.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_192b54204f154f80888b35578cb45893.pdf?index=trueIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_f55d418b674e47d5b7abaebbead705a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/vuworakilox.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/magento_certification_guide.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 4724 bytes
SHA-256: b4b3abe2cc7055f903b3c1a696aca405d9d85902f416bc6c2d13262e2f6a8648
font_01_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 11152 bytes
SHA-256: f325873396857dc3775af2b88fb107ad0644e581e5471691021fe5a9de5c37fa
font_02_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e