Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c53db98ae9438d6…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 15:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 512559d7dd2267e03d4e26d5234db994 SHA-1: 4605ffb40638f8cf59bf88973f5a35ffe2aadd60 SHA-256: 4c53db98ae9438d6c554e668a15c6a22f439f133606660c4c1e6a308571b3866
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to drive traffic to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=anker+keyboard+pin
    • http://pumorux.medianewsonline.com/does_accu_chek_aviva_require_coding.pdf
    • https://kifewaremavej.weebly.com/uploads/1/3/1/6/131606874/8748064.pdf
    • https://cdn.sqhk.co/feledigowud/9vOhgha/table_tennis_3d_mod_apk_download.pdf
    • https://ritewelikuwu.weebly.com/uploads/1/3/4/4/134493798/risoba.pdf
    • https://metonokosaza.weebly.com/uploads/1/3/2/6/132681587/linibivujuziser.pdf
    • https://cdn.sqhk.co/ruvonusebex/jfja3hh/sujaxegena.pdf
    • http://nuloriwilorij.scienceontheweb.net/welder_question_and_answer_in_hindi.pdf
    • https://cdn-cms.f-static.net/uploads/4366957/normal_600f80466b440.pdf
    • https://cdn.sqhk.co/dunokufimove/jieYhdQ/4383178472.pdf
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/wakuxewesaredevig.pdf
    • https://cdn-cms.f-static.net/uploads/4445531/normal_603da5877df29.pdf
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/ae5c2016dd7a6e.pdf
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/pasowidedixatuxi.pdf
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/a5c5c5119448.pdf
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/cf60387269.pdf
    • https://zesijijonade.weebly.com/uploads/1/3/0/7/130776416/mikutaru.pdf
    • https://cdn.sqhk.co/sadopore/hsggiUs/67972159919.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0a11630e-3e49-4823-9354-eb1655cdb41e/79326652289.pdf
    • http://bufijonewufo.onlinewebshop.net/kaliwojijejut.pdf
    • https://uploads.strikinglycdn.com/files/b0eae821-a4cd-4384-b174-afaec92de7a9/malikekatonapebixu.pdf
    • https://uploads.strikinglycdn.com/files/3ec5d174-113b-4511-b41a-6f21f3bba00c/71381977832.pdf
    • https://uploads.strikinglycdn.com/files/aff51f25-1c52-44c0-a274-2473d1e778e4/xedubufopezedejep.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_off0000ec6b.bin
1886263b9a9d0c13f005a7345762b52bd9985083f48325a9c561ca417cc10548
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 5036 bytes
font_01_sfnt_off0000fda6.bin
a9a9d7988cfb40a9b9280d40fd1a0e1ccfd05ba8a7d387f2ad235b6e838d371d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 11156 bytes