Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeec79b3f98a5f11…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 21:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 525033d1eecd94682d45de71f287466a SHA-1: 5a2563e5ebbd64ab5d99e874f31d6a40b0b9ae0a SHA-256: aeec79b3f98a5f117d152e103b232e90eb7ab809e0fee60db8a41fdcfabd49aa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, likely intended to manipulate search engine results or redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=maderas+de+cedro+veracruz
    • http://knitfqph.site/14001306478f7o46.pdf
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/vokaz_kibigaw_lezefowoviwo_ruzapil.pdf
    • http://buybritishcat.com/197064901794z3b7.pdf
    • http://vivekawiga.sportsontheweb.net/jokewidolibolede.pdf
    • https://cdn.sqhk.co/mijajijem/jdM3iiE/20304281311.pdf
    • https://cdn.sqhk.co/wezupobuwab/hgPulii/wisejabawifivup.pdf
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/potisizotezu.pdf
    • http://idealica-italiaoficial.site/aashto_lrfd_2017z5wob.pdf
    • http://paktum.pro/kexelozutedobiylb9o.pdf
    • http://fifonugimexa.22web.org/audacity_apk_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_c23a5f3aa6c242c390c888faabb41505.pdf?index=true
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_b76362d0e7b84b18b77231a110716ff9.pdf?index=true
    • http://bivojeda.atwebpages.com/bissell_powerforce_compact_belt_size.pdf
    • http://medetoti.epizy.com/baskerville_font_family.pdf
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_7adb5d5f7232459a899170658943e60f.pdf?index=true
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_e8e885c78971489e99020fbfd79e6fa2.pdf?index=true
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_0289c6eeea41445f809942d297e95378.pdf?index=true
    • http://ponuruv.rf.gd/35515361351.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce6.bin
4c9a2d237d4c10cb9be0ca9984aec6c9d1e25801c89718a3d8a2c2dccbb0767b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 5016 bytes
font_01_sfnt_off00010e16.bin
ac7b0a74effd872bd777ba3f3082f2a336561b813e37e8e706b5a656a00ec6d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 2052 bytes
font_02_sfnt_off000117aa.bin
c706921c139dc96ae135aaceab06714b351cbefd34012d3b5bbc31c77205fc4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 11832 bytes

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