Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e36f1d50a65827b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 00:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45efc521c465ce3fab0e943b3a9bddb6 SHA-1: e88542b6d7f62e6a11b1f3cb5e4c8648b7f8162b SHA-256: 6e36f1d50a65827b4cecc5dc2e0141564162b1616ce0b38b9124fb377d45256b
166 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a social engineering attack (ClickFix). It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to lure users. While no scripts were directly extracted, the presence of external links and the social engineering heuristic indicate an attempt to direct the user to malicious content or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/83201699851.pdf In PDF document text
    • http://alnadaoil.com/userfiles/file/73014460634.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85911329691.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/20605183367.pdfIn PDF document text
    • http://linker-apps.com/files/44465502454.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/78008392527.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/20718941900.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/vojarokekexumejopuxexa.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wigosob.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210907003755.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/lofejunepeko.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/jomekipujawuziwab.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/6420475118.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/2711093015.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/88967471688.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4579bcad49ec123759d8db9697eb2042/lubesopewazewawutiwomo.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-10-57-04-28.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/jowadiwokodanegikizugobug.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109101143483230.pdfIn PDF document text
    • http://lejuriste.ru/files/file/76984424028.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f882a082a---74272438540.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/20615544170.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/betibegarukepotegaxubod.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sutisepidizote.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/zofazipufulozawopelofajif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lg+optimus+p500+driversPDF 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_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 16908 bytes
SHA-256: 7e4d3f6d74dac5ee217b65920964103268eb9b9c50e46cc4d79d7dac0d81da36
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 10800 bytes
SHA-256: 10639a9622984bd9d39f7beec618150e5334ee0ca2651f3ea15a392d4a117fda