Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cba7b6e07db84b…

MALICIOUS

PDF

80.2 KB Created: 2021-02-27 04:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 836a309a789d7850502502ffa52489d8 SHA-1: 91edd8ab74d1ab1ccc7b5d5f9b919d5539dc3600 SHA-256: 34cba7b6e07db84b11ec097c6b2c624d2e1203d234f324265aea853c13893185
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to direct users to potentially harmful content.

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://dafemum.ru/123?utm_term=matricom+g-box+q2+factory+reset
    • https://sibozigoguxo.weebly.com/uploads/1/3/0/9/130969143/8827543.pdf
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/7302616.pdf
    • http://rababugizegir.22web.org/bsc_nursing_admission_form_2018_rajasthan.pdf
    • http://murunabo.iblogger.org/50513895897.pdf
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/f73f9e2f69d9885.pdf
    • http://jovuzutijokene.iblogger.org/rabbits_digging_holes_in_my_yard.pdf
    • https://cdn-cms.f-static.net/uploads/4475565/normal_600a6f5a430fb.pdf
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5ffebc28e2cbe.pdf
    • https://cdn-cms.f-static.net/uploads/4368251/normal_601468cadbc07.pdf
    • https://somusepuxe.weebly.com/uploads/1/3/1/0/131070447/vatidusosowas-dapot-tuluwutajawenog-bokafid.pdf
    • https://doxuvufunufake.weebly.com/uploads/1/3/0/8/130874670/8513401.pdf
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/rovogetuta_zumeborazelaz_zirovev.pdf
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/9198015.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woxewiwupir/zofuvalobukizisapowad.pdf
    • http://firuneta.rf.gd/16837243739.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_off0000fd34.bin
f8483880fbbde9a378f4ba26beb9cdea69708a4696a3afc8e2699a99efe3b93b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 5772 bytes
font_01_sfnt_off000110ec.bin
64831389470dfae0ea40f9705b850eee66b7c3e7ceadc8a7520137534552bdbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 10196 bytes