Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b83a2dfb759dfd…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 08:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e17142cdf06fd64464df4f833e7b786 SHA-1: 11dc209ec0e267ede550f76133d579c865c4e921 SHA-256: a8b83a2dfb759dfd5203e142d548a7c328fd715dd3ef1d0bc71d24a3d6e25b0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The document contains numerous embedded links, many pointing to other PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely intended to deliver a second-stage payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sofanet.ro/ckfinder/userfiles/files/gagujadoruvogibumepudi.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cea6a36d634e4c1b821798bf1799cdae/44746528190.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/56407591588.pdf
    • http://entrackintl.com/uploads/75805096397.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202109261106505171.pdf
    • https://osakaav.com/userfiles/files/tapanopezajewiduw.pdf
    • http://lonsdale.ee/tipikas/uploads/sisupildid/daluzesegufiwagifevu.pdf
    • http://actybrain-consult.com/Upload/files/doxakuvulotavotifegaki.pdf
    • http://vigen12.com/userfiles/file/67735318619.pdf
    • http://abwnickersonplaza.com/uploads/files/78369114188.pdf
    • http://wccflooring.com/userfiles/files/sixokeladanunajuxanewe.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/tewezetekesixobafugeseg.pdf
    • https://maturana.cl/upload/file/nulewilosurigedetujuwub.pdf
    • https://lacaune.hu/userfiles/file/82710870612.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_8562D254043BBADF.pdf
    • https://probidjp.com/ckfinder/userfiles/files/20210905_070030.pdf
    • http://modnyi-buket.ru/uploads/files/64462360463.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/69242851850.pdf
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/felediwobedobuwadoju.pdf
    • http://qcfloor.com/userfiles/file/najuxewaxizolasurofi.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/rapegizukawogonejabedupig.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b2b8o5qr9si015s5ktj0gvrlgv/46256206233.pdf
    • https://dnsbp.com/all4help/fckuserfiles/file/36198398138.pdf
    • https://khogiaydantuonghanquoc.com/images/news/file/nufepifuvawajuzuxiti.pdf
    • http://ajej.pretty-match.com/upload/files/20454236088.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=guitar+app+download+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afba.bin
0dd91bc872ba3732fa9d7d351266930e87da53ece6055f86c2318926ee293303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBA 14852 bytes
font_01_sfnt_off0000d55e.bin
cb459fe49cece8e8265a73bfb862f98e4b12bef2de3740c37aeda157a6f07dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 10400 bytes
font_02_sfnt_off0000ed0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.