Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a106de452a57f4…

MALICIOUS

PDF

47.6 KB Created: 2020-11-08 19:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa0a4d9aa1986867e2981ca4236ec2fd SHA-1: 143519629aaa30a610df9bbf5c213f6355dcec59 SHA-256: 53a106de452a57f40027161ed01a0b9c045e5b0fb654e262107046b511b5e98c
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating an attempt to generate traffic or SEO manipulation. The embedded URL 'https://traffking.ru/123?keyword=wiscasset+high+school+special+ed' is suspicious and likely leads to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://traffking.ru/123?keyword=wiscasset+high+school+special+ed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452374/normal_5fa0d12fe2981.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/vubuniwi-xifoziwaperagi-didiziju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f87663c9f661.pdfIn PDF document text
    • https://kasukironumasex.weebly.com/uploads/1/3/1/4/131454791/disabifasuf_fogiwubidaxijal_vifogove_tapodidoluwik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_5f9239501a765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f8846bac119f.pdfIn PDF document text
    • https://begumilipanup.weebly.com/uploads/1/3/4/6/134617951/lipalepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fa0f27156097.pdfIn PDF document text
    • https://zezujigodet.weebly.com/uploads/1/3/4/0/134012897/598bcbabb8.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/kubafezin/la_grande_odalisque_ap_art_history.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/galloway_precision_sr22_guide_rod_review.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/ib_history_study_guide.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_off00007aa9.bin
fb6cf89987fde0d12d63ab3d87cd318ccd67a392bb80cb3348f69a7f383be1ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA9 5252 bytes
font_01_sfnt_off00008c98.bin
a2166e919b08af70896a2f2e36f2dbbba1ff7f99b46ff3d553b7fb92ee69d75a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C98 10792 bytes