Malicious PDF — malware analysis report

Static analysis result for SHA-256 c707da369e4399fe…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 20:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0a721c61a69a0f8b404dce60616fea7 SHA-1: 88ba0f0ccde87aa7d426844572a4fe8e9c1e256d SHA-256: c707da369e4399fe00390aa2eb0b0e2f7ac21508f52127bfc388791f7d56c7f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://oniceh.ru/uplcv?utm_term=my+hero+academia+season+5+trailer PDF link annotation
    • https://fleschimmo.lu/userfiles/files/rerizenemamanerito.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd073d0cc0---51958602528.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/56320857069.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/8895466161.pdfIn PDF document text
    • https://chineseclothingonline.com/File/5462547436.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/koxalopolewalavijizov.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/65770412815.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewivubus.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/36987725599.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/xipuzosubereraxaje.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/zejapigasopadanogudelik.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/todudupasukoga.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/10284385424.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/71961058649.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/35352510583.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/xumuzujozopituxuxovezikuz.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/45197139507.pdfIn PDF document text
    • http://land89.com/ckupload/files/68975223366.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nusimejiw.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/lozovonigugifadatosom.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/65578259806.pdfIn PDF document text
    • http://banquat.com/userfiles/files/31543443675.pdfIn PDF document text
    • https://seerupit.dk/assens/file/61711090777.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/nedag.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_off0000aeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC705 10876 bytes
SHA-256: 153b825392aa2f07de3b90b246fce867d48b1307f7bb70587021255f68af9089
font_02_sfnt_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 15220 bytes
SHA-256: ccbe9edb665e4f8ab6242ea0c9bacbbcfa71a11a52b11e0c9f0c09314921933e

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