Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcb1ebb3747a5c2…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 18:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 044fdb61518de00b8eedbad16229369b SHA-1: 2ec9ae91c812e76dd4135ca36eb25e7b384486f0 SHA-256: 9fcb1ebb3747a5c25c4b659211e890d669703813837bdd96054cb66382aa0270
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, directing users to numerous distinct hosts, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://terredellamagnagrecia.com/userfiles/files/jepopogubizizofe.pdf In PDF document text
    • http://soyaksiesta3.com/userfiles/file/tozetekawikuzebir.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/tikudekonimip.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109162259253845.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/redizakurulidumodadesis.pdfIn PDF document text
    • https://vleek.com/uploads/files/todevejuk.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1e73o6jm3ojd8ld7t1ad7808s0/66474167322.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/tudipatan.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/62796690284.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/13354133792.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/sedepanotemufotu.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/gepedojetozijusodirilibo.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/73801519375.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/27174190341.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/kipalatinunubebukuf.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/rurisefexike.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/6424754083.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wufavanetap.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/xofolatazutubemu.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/razawoli.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/38385792229.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/puwenofosulonokapi.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/nufipusolegadajerozag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=solomon%27s+keep+mod+apkPDF 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_off0000ad34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD34 10464 bytes
SHA-256: a0eeb668b116d4c45e2d71a23a6fc660db2f512b5f9df8d7db8ef030947ff40d
font_01_sfnt_off0000c4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F1 15832 bytes
SHA-256: 779a9a5cc2ab4b238273b9fefd443a11323e35f14e536536b356cb527f4820e4
font_02_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1