Malicious PDF — malware analysis report

Static analysis result for SHA-256 780391fbaba580bf…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 23:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8101e7ba539e6c15083d9811dc104f99 SHA-1: cfed0881e87b26a4385c8f88a1077d218be9620f SHA-256: 780391fbaba580bf67a01dc7a98d169c8d372c78ce88e703f2b344267604c1ab
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, potentially disposable domains, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ijtm.in/userfiles/file/72806486238.pdf In PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/81640879774.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/nilajoxujukepejezetusewe.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/17929559240.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/vobevi.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/vogibugevabitapatoz.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/3276516062.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/ritavesufe.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/42393264878.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3d033d222823a8206af820b3b67d83b0/jokemadinebi.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/49344647087.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8baf6086f61dcdfa13e8a86915ac683e/vaxapafudujizo.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/2669066066.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/pudemanirixovepapukowab.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/vanixusopovokovagi.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/rozadofosodidofunarigumev.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210924002734856.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/57518978758.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/budumamatawapos.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210923_D8E2653354509603.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/43961803716.pdfIn PDF document text
    • http://hiddencliff.kr/FileData/ckfinder/files/20210904_FC725B35DA6918AB.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=japanese+android+app+storePDF 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_off0000ad05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD05 10328 bytes
SHA-256: 455dbc44d1256517998747ebea6a9304b9d3cec260719657142e2e6723130675
font_01_sfnt_off0000c470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 15316 bytes
SHA-256: 31c05adcc883c4eae1099cbaa57491c4623af2f1ea41d73af44670da7deb773a

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