Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e71fb883187c459…

MALICIOUS

PDF

85.8 KB Created: 2021-10-11 12:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f42c07d7d5373ea3aeec1a96ff8e5304 SHA-1: 9c4b3107acb852a7a023ebb958c4505252f0ba7a SHA-256: 1e71fb883187c45913cdc6d5505f51129df5c856de72232d52968e86aa40aa40
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to different domains, suggesting an attempt to obscure the ultimate destination or to leverage a large number of potentially compromised sites. The embedded URLs, while many are marked benign, are part of a pattern consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://autoachtercamper.nl/userfiles/file/37701845852.pdf In PDF document text
    • http://tartak-monis.pl/tartak/images/file/selidemunoketafu.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/39335055887.pdfIn PDF document text
    • http://newshop.jp/archive/file/45681118482.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/51940668574.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/tutigizuxorererojajes.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/78196495498.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/90720207480.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xutexadepusogogebonanune.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/61732489795.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/tusaliwi.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/60569358502.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/fugalosorogojefot.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/39062980204.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/96643750880.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/4456230288.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/63999509321.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/98469193488.pdfIn PDF document text
    • http://gocash2u.xyz/userfiles/file/58730597202.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/70491913957.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/negugumagakivotumazu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/58211085621.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-10-09/images/files/18341792081.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9389b2e8e---lizisisirojov.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/99565769581.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/dorabiji.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=2019+kx450+owners+manualPDF 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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 11036 bytes
SHA-256: 2488e0141db8a28a9bd402a98456d5b328708b547ab179cf8e792eb2b5c8e988
font_02_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 19144 bytes
SHA-256: b64bf37af6db72808ee13ed9ecd860ada4365a823991431ef2c731378ac82288