Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec36c83f08a89fd1…

MALICIOUS

PDF

76.7 KB Created: 2021-02-12 21:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 120ae3b1122163f80ed26e20706536e5 SHA-1: e4a84a349540a07313c2de43c869f10c68195447 SHA-256: ec36c83f08a89fd1683f65863f6df2650e06b1f311894d39f4d3fc797a6cefb1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URIs suggests an attempt to redirect the user to malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=rimworld+night+owl+won%2527t+sleep PDF link annotation
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/fc6a9.pdfIn PDF document text
    • http://kufigada.22web.org/rixunijigerilu.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/cggUDhI/27799895484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_600d39ce96ac8.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/GhjuiiK/dipixeda.pdfIn PDF document text
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/3223775.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/hjVhbja/ios_music_player_no_ads_apk.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/7474993.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/palirasip_sevevuno_xufomimudowero.pdfIn PDF document text
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/sabixinenepegojojuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mixanaz/puvoto.pdfIn PDF document text
    • http://balazetesu.epizy.com/converter_exo_to_mp4_android.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/70145147420.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/suvubomoginonome.pdfIn PDF document text
    • http://jarebavax.epizy.com/75056696235.pdfIn PDF document text
    • http://povapetaranawo.rf.gd/patapukoxizijujuwunu.pdfIn PDF document text
    • http://xokesuluz.epizy.com/affidavit_format_for_name_correction.pdfIn PDF document text
    • http://zelogano.epizy.com/wixosesonepodeze.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 5296 bytes
SHA-256: f35527e7378c29210ddd4bd95682c02a47ffaa24efb4a5b6aa70ef0cd0bb3461
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 10592 bytes
SHA-256: 5ff32ec1080330d0432a7c101814fb90488d62d10df395e99ce7fd972b5ca450

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