Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa24e1d0d7ac6886…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 12:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0060905c0813db3689096679d8fc887d SHA-1: 4447cd66f334aec9e3810209f9e2e1dd4913828e SHA-256: aa24e1d0d7ac68860ad69cca08d3a1846ecddf4758028e49e06d508ac63bce9b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The 'utm_term' parameter in one URL suggests a lure related to a book title, potentially to entice users to click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=kingdom+of+the+wicked+james+patterson+pdf PDF link annotation
    • http://hanauhrova.cz/files/16159414024.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70226685736.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912203202.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/paburipizulokev.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109182014533798.pdfIn PDF document text
    • http://martonelektro.hu/files/file/56492886789.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/70909918681.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/64406253518.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/47193693271.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/fobomapipupenufu.pdfIn PDF document text
    • http://asid.rw/userfiles/file/6757966144.pdfIn PDF document text
    • http://theponghop.com/upload/files/givivipufofa.pdfIn PDF document text
    • http://camonetinternational.com/files/file/19128515657.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/60717173106.pdfIn PDF document text
    • http://airzo.net/userData/board/file/70283286547.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614979ad57125---53474501765.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/75238561274.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/kepufeselebudejirasom.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/54531253101.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/82665469706.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/78383857869.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://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_off0000afb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB2 15268 bytes
SHA-256: 04fa2d2e8184ffeb3c1968a6016d3960e51bfa2271dcc1ca8f1ecf6458843b0e
font_01_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 11320 bytes
SHA-256: cab634092d4a2c8618c6304b102aba4d8726841450a2531290ef00250a2fde57

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