Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7845fd9df164a6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 02:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75969716aee3597d1af1ecefeb0fdc52 SHA-1: d673e24a4da5abef98e6d4a16c0c77a58710bfbe SHA-256: db7845fd9df164a6aa6751bd4c9b1a5f44b2be88dd73d97c43945b7db3683d94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=how+to+encrypt+phone+android PDF link annotation
    • http://elverum-revmatiker.no/images/file/48333835518.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090504215027.pdfIn PDF document text
    • http://gibisch.org/files/files/23431015336.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/96953800195.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/duzunavu.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/jesan.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/zizexogimikofevajujuni.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pufutamog.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9q2nd1p8mvl6ch2ulumeeogj3i/remarariw.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/15549638883.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/pilufofixowisiza.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/dijokofididakelo.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/kalijerifawerukafado.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b043352d15db75810d973c18e7b262d5/81355382820.pdfIn PDF document text
    • http://robbes.nl/media/files/2028788502.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/28900365422.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/14461686261.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/47870193802.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/zifopav.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/12951736915.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/80353335215.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/wivipobilebiwagik.pdfIn PDF document text
    • https://ghnservizi.com/file/14812806398.pdfIn PDF document text
    • 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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10588 bytes
SHA-256: 6e980b2bd4dafbbfa77509dc3bb8ea09238977d9658bb96437b53d10db94d9f1
font_02_sfnt_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 17620 bytes
SHA-256: 8cd8e1cee7e0628475ce2c5e734832b4246e5c53ea1a2c5a029d8aab4daa918e

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