Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4a668d79a48438…

MALICIOUS

PDF

75.4 KB Created: 2020-12-10 09:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf5dac11a2f3b7e6008c03714c35e735 SHA-1: b7337a9bae695b657d3d6c98e88f3bb19ee9b746 SHA-256: ba4a668d79a4843809129e01b04fc191081e7e3e637b3426fc55c59acc65dc9b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to potentially malicious domains like 'traffking.ru' and 'sibitolifi.weebly.com', suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains keywords related to Android developer options, likely used as a lure to entice users to click on the embedded malicious links.

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://traffking.ru/aws?utm_term=android+9+hide+developer+options
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/8fca357.pdf
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/3973568.pdf
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/4472734.pdf
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/kepevaz_ledugonirok.pdf
    • https://fekogekakoxoki.weebly.com/uploads/1/3/4/6/134625435/tazebam.pdf
    • https://kodepifaz.weebly.com/uploads/1/3/4/7/134705681/doxorofuzinikizab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cf13a9f6-0544-4382-92cd-d00717da1d7c/15977059225.pdf
    • https://uploads.strikinglycdn.com/files/a17e9a09-d1c9-49ff-b212-de159e2df996/japubabizenepamugi.pdf
    • https://s3.amazonaws.com/tezofuretejom/cancer_de_pulmon_articulo.pdf
    • https://s3.amazonaws.com/fekazudabo/condensed_report.pdf
    • https://s3.amazonaws.com/muvemasoxaji/internet_scavenger_hunt_worksheets_for_kids.pdf
    • https://uploads.strikinglycdn.com/files/a61777c6-e958-44f8-a383-b65ff20ca410/78560829943.pdf
    • https://uploads.strikinglycdn.com/files/7c17312c-4927-4dee-b47c-256f5a59990e/tikewijujivevetabuzojas.pdf
    • https://s3.amazonaws.com/jazuravazaguz/egypt_concession_map.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_off0000ec90.bin
0dd50850428587e77e619413bbead1c58518e0173e721a6c9c6ce2b54620c1f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 5044 bytes
font_01_sfnt_off0000fdb9.bin
570572f149dc37f3ff54246ca0fd77a33d106d309ee5574faaaa633156f4591e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 10292 bytes