Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1b7bd619068842…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 09:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3715a5f62158d866ee14e589d3e41ff3 SHA-1: e496bb60cf4c780e92197a7158c5ef01d0461e6f SHA-256: be1b7bd619068842f263b752304a03febcf17cdca88f1240077fad3ae6dec201
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URIs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=moto+g6+security+update+2020 PDF link annotation
    • http://studioscoponi.eu/userfiles/files/patavuragitegideza.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631186310.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/99494559479.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/26034987004.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/54032634166.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/taxulenatibe.pdfIn PDF document text
    • https://pakistanchristiancongress.pakistanchristianpost.com/userfiles/file/rokavasupibovuwuru.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/kokasomivoxoruvop.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/tabitaxotapugezugotox.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614730337ce67---dofiruzugotebevinolonuga.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/godajodulavu.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/56789230929.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/83741450127.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/59879776394.pdfIn PDF document text
    • http://splogservice.ru/content/file/18958803394.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/24627086485.pdfIn PDF document text
    • http://annabarons.com/files/files/41987669626.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/sapalig.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/togukowun.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/59944379169.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/93139550198.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/69595845972.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/benubolutawa.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 11156 bytes
SHA-256: 17e210ada12e142fd784b630924d0a68f1b37c97c36c3e5f93b79e3583837157
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 18068 bytes
SHA-256: ed26e2c5c7a70e485e97d265a633d0b5256804ec796ff2e957fb6bc127e6cd56

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