Malicious PDF — malware analysis report

Static analysis result for SHA-256 433edb5e7b237390…

MALICIOUS

PDF

61.8 KB Created: 2020-11-10 19:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 530d4918fd7ed3540f8700bcfc56197e SHA-1: ef2b080f4b7b1b1a0fcb2a23ec8c00d5494c8407 SHA-256: 433edb5e7b237390af8a9d8bd4cd3e77a5adae5c891057b62053f0b518f99a5c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. One of the embedded URIs, 'https://traffset.ru/aws?keyword=great+gatsby+character+worksheet+answers', is particularly suspicious and likely serves as a lure to a malicious site. The document body, though heavily obfuscated, appears to be related to a worksheet, reinforcing the lure. No scripts were extracted, but the overall structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/aws?keyword=great+gatsby+character+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5fa9562c227ea.pdf
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/gatejiwar_nabarinoditexu.pdf
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/53d96a82ec396.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cc6d3c07-df82-444b-a235-1aa54f961d18/jilaguwefaximefe.pdf
    • https://uploads.strikinglycdn.com/files/fe2feafd-31e4-4cc7-b976-73782af61faf/69665307302.pdf
    • https://uploads.strikinglycdn.com/files/5399c64f-6e9b-4eb5-8167-a10e5fdb663c/48310647255.pdf
    • https://s3.amazonaws.com/susopuzupure/mefisufepinetave.pdf
    • https://uploads.strikinglycdn.com/files/974c2cd2-2f39-4aed-ad44-c05d332e2c82/32_team_double_elimination_bracket_fillable.pdf
    • https://s3.amazonaws.com/jamokaroxoj/writing_task_2_vocabulary.pdf
    • https://s3.amazonaws.com/fulazelof/46997513098.pdf
    • https://uploads.strikinglycdn.com/files/aff5934d-275a-4859-96c0-cbdf0e40b09f/private_mag_free_download.pdf
    • https://uploads.strikinglycdn.com/files/607a8130-cd86-4cf3-ae67-8e8e990f22f0/28251985568.pdf
    • https://uploads.strikinglycdn.com/files/db1e593a-ab42-43f6-9869-b7822bd4f319/20357282597.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_off0000b6cf.bin
03c8c7711b73f59267085c313c570712668af5ed765a39dd9e44531750a7fb79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CF 5460 bytes
font_01_sfnt_off0000c976.bin
e9858c0a25500e0a6792b2bc0cc32e7e9db63230966815d57455cd7d0f85f9d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 9700 bytes

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