Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b7435d23c15c77…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 21:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b1ddbdc2c2c62f4b500a2ac30d9c299 SHA-1: 3691a7b79c696fa950238d8161e0b6b4fff23ee1 SHA-256: e0b7435d23c15c77d20a46aedf73af50dd44ff8e433def9ddcc34318cc3fc792
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f65fafd67---fubub.pdf In PDF document text
    • http://aranykoronakft.hu/userfiles/file/labaketudexitaziwuwakum.pdfIn PDF document text
    • https://majubesar.info/contents/files/noligabafizesorek.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/87103582474.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/nojuvorosufesugir.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/76113158994.pdfIn PDF document text
    • https://betsin.org/userfiles/files/12470607482.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/82531222309.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/84475166272.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/39862045829.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/63876467089.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///wibederenemazemajuse.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/27488487906.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6c02b5067be5595ff974a37118facfc0/95176676533.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/vudezi.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/37573220126.pdfIn PDF document text
    • https://termoformat.md/img/files/wojuke.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/54321940460.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lojogefigesizimop.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/bomatanesolapiwopuv.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/mowanobelaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+illegal+movie+websitesPDF link annotation
    • 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_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 16832 bytes
SHA-256: 3aa8fffad1e3a62d6030cdbd4437d795d7ab5f5e06b04c285cea3edac926c114
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 10616 bytes
SHA-256: 816e42273d079be54c85c575993f8edf9fc0d0c1f81a290b6acd60fd5ec320d7

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