Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cb7794b66116e6…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 19:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 97659735cbddcb50c0631d64d07becc6 SHA-1: 65e354f6fdec6d52fb7dc13b31c8150929c13e28 SHA-256: e2cb7794b66116e66f1cd625f10d0c802496ac4e3a4e46870810c84a1fca16fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to direct users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://goang-hann.com/uploads/files/202109081357255535.pdf In PDF document text
    • http://tzoetemondje.be/uploads/files/33541308212.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/47997703787.pdfIn PDF document text
    • https://qkon.ca/images/file/somokafujamopesetog.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/39128373145.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1852c7ce6bcb699af280e1e249b3b4df/65930865869.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/sulevumadizetafepujoto.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/xatekotuporanunupawazukad.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/mutasitup.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/zisuwikuxozozaninuroji.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/92481893728.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/rozixofajuvalep.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/41884006687.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/kijezi.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/kutekuxovaloz.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/99303846359.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/71480136832.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b2ulq94tkji03aob74e0avrp1m/50086061015.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/54318374580.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/57773622335.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/25549537106.pdfIn PDF document text
    • http://otczenacts.com/media/files/40469476263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=iphone+to+android+hotspot+not+workingPDF 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_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 10752 bytes
SHA-256: 78e91f2b807927b184a32b460d3b223b8e46d852980c48a98fd4132d74dea8a9
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 18204 bytes
SHA-256: dc7be4a626af7c8f25c5e8c9a8c4e014269a5284c8a663a5a3d43a562ceba2f6
font_02_sfnt_off000135cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1