Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f907a87d51354a0…

MALICIOUS

PDF

70.7 KB Created: 2021-09-23 06:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4e3c48e4008cde5abed3b92e933fe99 SHA-1: d4d0f79b8c6c137adf431f1e32d6d1655b49b0e1 SHA-256: 9f907a87d51354a0b49f770041969a13f594ccf097e421c3b1b842838b394827
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs that likely lead to phishing sites or malware downloads. The document body, though heavily obfuscated, suggests a lure related to software updates, a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://torbay.ru/images/uploads/file/41654614803.pdf In PDF document text
    • http://jingluo.net/uploadfiles/files/nulotorijixexo.pdfIn PDF document text
    • http://bucatariizidite.ro/printuri-fi/files/14089594074.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/nogekimezaxewamiralufetu.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/10575207447.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/022337bfa95c728bca8590c0b454f5eb/41240713233.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/53071750926.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/mopinewila.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/39857067866.pdfIn PDF document text
    • http://ed-union05.ru/files/file/ragonivimosibogojige.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/wobixunuleg.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/17658731627.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/e39vldpmpgsccdt4sjhf0v9gs2/rozafekeludix.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/19517346763.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/79557891664.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/52049878471.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/nijibapomotu.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/94363888065.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/42650859310.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/66063821658.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/65021496478.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/juroxowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=update+manual+miui+12+redmi+note+8PDF 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_off0000b11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11E 10872 bytes
SHA-256: 3c591b5cd6a00cc3f486e54501a14579bad52468fd04bd9c956582f699d7a327
font_01_sfnt_off0000ca3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3B 16428 bytes
SHA-256: 85ee20075f90e1ebc84f7ba5bef9719af44d5f791d5789e02f098fa3ee4967a2
font_02_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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