Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1584631f5b119da…

MALICIOUS

PDF

75.0 KB Created: 2021-05-05 15:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3e6e14e3e5d24a768f464b69276f264 SHA-1: 08b56b425c11f7a50c740456f8eefccca102c22e SHA-256: f1584631f5b119da46addf183becebbc6316ccfa38eff140709e15f1d20456ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=why+does+my+honda+pressure+washer+keep+cutting+off
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/jexalimofixanixune.pdf
    • http://rewetuxavix.mypressonline.com/xivako.pdf
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fe341a4c7c5d.pdf
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/kodakezep_xorabevulu.pdf
    • https://cdn-cms.f-static.net/uploads/4383806/normal_5fe812345a3dd.pdf
    • https://static.s123-cdn-static.com/uploads/4456998/normal_6002d70db1432.pdf
    • http://lebedugipul.mywebcommunity.org/asbabun_nuzul_al_quran_lengkap.pdf
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/larulinidipajez.pdf
    • http://azakalaza5.xyz/samsung_hmx-f90_camcorder_chargerpynwh.pdf
    • https://static.s123-cdn-static.com/uploads/4489035/normal_6002027851313.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a1227827-2db4-44c6-80e7-2fd67e4bf9fb/rekidofabuxuvukalenuvokew.pdf
    • https://uploads.strikinglycdn.com/files/cbe51470-411e-4179-8a93-661bae776744/zazubefeti.pdf
    • https://uploads.strikinglycdn.com/files/b7397c55-7638-4d60-864f-5ebf5c278306/tp-link_tl-wa850re_manual.pdf
    • https://uploads.strikinglycdn.com/files/5c50eae8-fb59-4177-b9b1-93047febfcf3/dofuserufoponegevadu.pdf
    • https://uploads.strikinglycdn.com/files/83b599e3-199a-44e5-9dfb-4671d192fab4/19083147222.pdf
    • https://uploads.strikinglycdn.com/files/1d0a0fad-7aae-471f-a2e8-6b0b59453856/skyrim_se_how_to_install_skyui.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d2.bin
ee8088af2f6312afd9551040cf2aa8fc72bfb675303bb6d6bd89847634978dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 5808 bytes
font_01_sfnt_off0000f994.bin
a2c0ba679b09c42dec0c13cdc16c3fbe3ad7b6b693f73479126371c36844f497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 10852 bytes

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