Malicious PDF — malware analysis report

Static analysis result for SHA-256 213eebae284666ad…

MALICIOUS

PDF

71.1 KB Created: 2021-02-13 20:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fa1e4632ee2a8473b5c4c970527061e SHA-1: bc392e7e9257d6d9b4a200751bc51f33aba89cb6 SHA-256: 213eebae284666adf53c894504353b40b386470766de6ae728ab65543bad38de
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "link farm" by heuristics, suggesting a phishing or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

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/wix?keyword=droid4x+apk+install+failed
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/nuxogikibavup-mafopejutaru-vokapuvun.pdf
    • https://cdn-cms.f-static.net/uploads/4500432/normal_601b08d0efc7d.pdf
    • https://cdn-cms.f-static.net/uploads/4458838/normal_5fd61a7495b26.pdf
    • https://lirurarupo.weebly.com/uploads/1/3/4/7/134770738/260ffa3405c5.pdf
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/totevaleromi.pdf
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/5583348.pdf
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5fd9933941e4b.pdf
    • http://selozufuwadapuw.66ghz.com/attendance_sheet_in_spanish.pdf
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/34917bcca4a372.pdf
    • http://italiahot.space/6edgw.pdf
    • http://expressday.online/walutunegepobibuxwmap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zulojazivuvuk.epizy.com/hp_elitebook_850_g5_service_guide.pdf
    • http://fexojuvaf.rf.gd/insurance_contracts_regulations_key_fact_sheet.pdf
    • http://sabuxixu.epizy.com/53665223318.pdf
    • http://keruxenuriwi.epizy.com/ultimate_business_card_maker_apk.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_off0000d720.bin
0eca5e79e9d4e96c0b6976c446201c008df47e655bbdb27385585398e19a70d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 5256 bytes
font_01_sfnt_off0000e91f.bin
764d4bde731d11f8473e428306cec54f6623f484d66d98cf4c43aadcd87ea58d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 11744 bytes