Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d35972e96342f2…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 20:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1eb966e193f0c8af1d393d32c0ead068 SHA-1: 515792e41a48dc26d2c5690d780cd6d53615d4f6 SHA-256: c6d35972e96342f212a27a45fefa921f2e5d7c0574cd58ace11390d4845dacb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a downloader or redirects users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=how+to+connect+android+to+pc+via+wifi PDF link annotation
    • https://perfecthospitals.org/ckfinder/userfiles/files/dibewunowetijulokar.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/kerapimubenikunorabip.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/buxut.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/29491333255.pdfIn PDF document text
    • http://firegallery.ru/img/upload/wesevedexok.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/xixakevibotadajerijipi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/totalebosokegusamiraxit.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630981260.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/27246120372.pdfIn PDF document text
    • https://ewt.cz/res/file/95756383852.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/5590522793.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/suwalewaz.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/majiwixex.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/80296941512.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/98189609658.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/pubaronus.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330c8e5267f---busatafidudiwez.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/53055394935.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/sovonakulivivurubaw.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/wuzugoxuvudep.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/57488598181.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148d715548f8---vanuwanavube.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/63188197730.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_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 10544 bytes
SHA-256: 826b1d99e2cf1053247238853d16275e5accc77b2c0275e0d3d8320b3a9ba2a7
font_01_sfnt_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 18220 bytes
SHA-256: f94e77df2b3b4cf9212df93ce9f49c6040306da9ab132447bda1ede4332ffa66

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