Malicious PDF — malware analysis report

Static analysis result for SHA-256 2640c479cfa46031…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 20:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff2a08e4fcd2a7d4e380c746e406f9be SHA-1: e27ec3ee94dabaef5bc471053e691d824d397d60 SHA-256: 2640c479cfa4603195a7fd8d3edced90fb75a09faa98c8c41fa5a3802f8e33f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm with numerous disposable hosts suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and does not provide clear textual content, but the embedded URLs and heuristics point towards a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://auxerretv.com/content/public/file/21266655313.pdf In PDF document text
    • http://jatechkj.pl/upload/fck/file/25443700525.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/rolajalonomeguwu.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/53975770164.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/masokelezivovufuzem.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/rovuzalatiketamabev.pdfIn PDF document text
    • https://aneri12.cz/res/file/50504053838.pdfIn PDF document text
    • http://mc-opony.pl/files/file/52850478123.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/teletig.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/ziwiriba.pdfIn PDF document text
    • https://btegypt.com/file/57136986744.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210909/210909061723034227a6w7bc7sykdb.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/paruvix.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/22625639245.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/70826938637.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/53803305826.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021913828595155.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161373a63d2262---jikixa.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/renoxukuwizapono.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/34345957127.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/fibubomixusujume.pdfIn PDF document text
    • https://yellowstonewildlife.com/87977099390.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pajagosakevabopefudired.pdfIn PDF document text
    • https://bawauang.com/contents/files/13226032508.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f31c9d2b83---24143578144.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/38680697022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=play+store+game+makerPDF 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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 19344 bytes
SHA-256: a6b9e7326ae7520310374b341fab182b8f43d526684ec7fbb07fbece4aeed9aa
font_02_sfnt_off00012b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 10464 bytes
SHA-256: ae84b535aff4da9ab900550a4e0f549347e89a97e510d5ba2ae0741310ff0bda