Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26b7072cb65d68b…

MALICIOUS

PDF

86.5 KB Created: 2021-02-26 21:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 40c77855b44fb0742b33cf040c5a7433 SHA-1: 964adceaa962088e365aa87cea8d50b723f1deff SHA-256: c26b7072cb65d68b6d75fbbb18fbbc2cff9c4968c3aaedfb67f4c5abcbe6ed3d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including suspicious and disposable link farms pointing to external domains. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. Although no scripts were extracted, the presence of numerous external links indicates an attempt to redirect the user to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://gimoguvi.ru/award?keyword=singer+sewing+machine+model+237m-a PDF link annotation
    • http://jofufunobek.sportsontheweb.net/how_can_i_build_my_neck_muscles.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/whirlpool_duet_sport_dryer_not_starting.pdfIn PDF document text
    • http://devgm.design/indicators_of_potential_workplace_violence_answerm6tn0.pdfIn PDF document text
    • http://uplrezina.site/52631864532jxgo0.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/android_color_int_to_argb.pdfIn PDF document text
    • http://naturaleone.space/touhoumon_another_worldapn19.pdfIn PDF document text
    • https://bozofapenori.weebly.com/uploads/1/3/5/9/135965419/giwosotozeret.pdfIn PDF document text
    • http://tolumobibuseg.iblogger.org/88465287983.pdfIn PDF document text
    • https://saduzoxizujakef.weebly.com/uploads/1/3/1/0/131071125/latugawomosiwas.pdfIn PDF document text
    • http://nextauto02.ru/31068093687ec2qg.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/ap_online_challan_entry_formvsr4r.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/tomamujuf/barnett_jackal_user_manual.pdfIn PDF document text
    • http://surifetopene.epizy.com/kamolovef.pdfIn PDF document text
    • http://tefabonapo.rf.gd/45425118681.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/juvenile_dermatomyositis_treatment_guidelines.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_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 5956 bytes
SHA-256: 3ca736e8b297c1265504c79db5eb281be8cdaaa8ca469a6eac9f530c0d30a3cf
font_01_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 10968 bytes
SHA-256: 0b17defa873a92360b2823464aab8ac4fc411f9163bc024549dfb78765ce2300

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