Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fa19d2e120b01b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 14:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de9aabae244ebec37032f62221833879 SHA-1: 5624142f6e9b45ce82290ba6b2dc8ad0f581cf85 SHA-256: a2fa19d2e120b01b9a5d12a93fbcc0f6368e0995cba84ee241b48fd6e42e42bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially malicious external resources.

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://soxebez.ru/award?keyword=cbse+syllabus+for+class+9+social+science+pdf
    • http://xoroketogejuxe.mywebcommunity.org/bacterial_transformation_lab.pdf
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/zobabaneragam.pdf
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/jipakobeb_xaxob_dadesuxutusizi.pdf
    • https://zulupilasafa.weebly.com/uploads/1/3/1/1/131164294/rademebomu.pdf
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/gopamavitar-pejuvubotalo-xirujudi.pdf
    • https://mikovenib.weebly.com/uploads/1/3/0/8/130813447/6782867.pdf
    • https://vonenubu.weebly.com/uploads/1/3/5/9/135964133/cf8e3f1.pdf
    • http://jopagozopive.medianewsonline.com/accounting_journal_entry_practice_test.pdf
    • http://jiteruruw.sportsontheweb.net/mizutu.pdf
    • https://tomasuniraruz.weebly.com/uploads/1/3/5/3/135392941/ea3bf.pdf
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/mukobisuxawoj_xizasofis.pdf
    • https://tedenugimug.weebly.com/uploads/1/3/4/3/134345185/xatavusataru_nepukot.pdf
    • http://mevesepegubisis.scienceontheweb.net/56656842890.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mukutud/42127470666.pdf
    • https://s3.amazonaws.com/tolivajupeku/sekuguxusotumexevon.pdf
    • https://s3.amazonaws.com/liwara/kisokorurojoremadezevivej.pdf
    • https://s3.amazonaws.com/nigimul/kuwumaxuxewadesuv.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_off0000f037.bin
3da6416a4cb68323e89a9afd435cacb6ddd4efacb67c96a7d9f81ada9bd13cc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 5452 bytes
font_01_sfnt_off000102c6.bin
e9515ecabb4a12665035eea7ab9f8ba9ec43137a5c426db3a174c9bd630f2ec9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 11076 bytes