Malicious PDF — malware analysis report

Static analysis result for SHA-256 71afdb4e4e3cb87c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 06:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: fd96e2b94181f3d6124eafa495074398 SHA-1: 138b0aaad6dbb6150d8c38228e4a74b582dfddd7 SHA-256: 71afdb4e4e3cb87c7b8c2ba432eff17cb89f82bfbf5219471d5ed7f95a061872
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

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://crysiq.ru/uplcv?utm_term=android+change+language+at+runtime PDF link annotation
    • http://berbun.com/user_img/file/32660027183.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/67657111221.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/gelixo.pdfIn PDF document text
    • https://olterus.org/contents/files/62017714198.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/tifopobavajixunopuromevog.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/47682449081.pdfIn PDF document text
    • https://best-label.com/upload/files/lunudoverikus.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/zadofegelixu.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109112156408075.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/zuxiluk.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/56160192797.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/33770038722.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/diwudoroxagepewovuvu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/5274963816.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zuwowo.pdfIn PDF document text
    • https://majubesar.info/contents/files/mogexufiweno.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/risunetebojonewos.pdfIn PDF document text
    • https://dm288.rs/slicice/file/45372504518.pdfIn PDF document text
    • http://teresachild.com/upload/files/54734202978.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/zakawi.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/21560196041.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/90452451937.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/78706643916.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_off0000bc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 10728 bytes
SHA-256: 8100a8005b541f21cf4a8c16f622d9778ec335f0ba931296df18cac092ba6dd5
font_02_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 17980 bytes
SHA-256: 685c9ed2820a53a4faabaf7c23ae358f65ccaefe9e5f4c9a0eedbf1668e81fc5

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