Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4451e42b91cfeb…

MALICIOUS

PDF

76.6 KB Created: 2020-12-18 01:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a81a0daf0c4c0a91fa00b7d6d6ee6057 SHA-1: 7bf3f72a02203b5f25860470b93c345f5e4fc1b9 SHA-256: 4a4451e42b91cfeb7a969a3bcf33649b2d48a9bf9d2e80a32acc9ef29f00cf25
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is designed to lead users to phishing or malware sites. The document body, though heavily obfuscated, suggests a lure related to 'Sharepoint migration interview questions and answers' to entice users to click the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=sharepoint+migration+interview+questions+and+answers
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f8c8b12315fe.pdf
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f9896ba5f88e.pdf
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5fbdd4d75bd82.pdf
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5f9bb8361205f.pdf
    • https://cdn-cms.f-static.net/uploads/4402940/normal_5fbb9f963dc13.pdf
    • https://cdn-cms.f-static.net/uploads/4464083/normal_5fb773e77018d.pdf
    • https://cdn-cms.f-static.net/uploads/4370284/normal_5fb4cddc44201.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wajufifenoxuj/53258935916.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/98074814841.pdf
    • https://s3.amazonaws.com/loranoduzuja/58812052397.pdf
    • https://s3.amazonaws.com/wekibik/zumuwalodakiw.pdf
    • https://s3.amazonaws.com/vaxebisapesi/oxford_dictionary_offline_for_android.pdf
    • https://s3.amazonaws.com/tawovojo/gasejoletazamofubitaseju.pdf
    • https://s3.amazonaws.com/rixevozajixezos/human_body_template_free.pdf
    • https://uploads.strikinglycdn.com/files/d05742f0-c287-40ca-b3c2-b3b09457b7d7/8611573796.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e094.bin
fbe8786ebc00fd9526f2c6dac2b6d8579952d2a2a7c3f017f0ccf59aaeeae92a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 5604 bytes
font_01_sfnt_off0000f376.bin
84eb26fa96375a151f1e2b01c798c3111a7e7a87fc819c9d549a053fcf448838
pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10316 bytes
font_02_sfnt_off00011684.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 4324 bytes