Malicious PDF — malware analysis report

Static analysis result for SHA-256 712eff5aa150690e…

MALICIOUS

PDF

82.6 KB Created: 2021-06-02 05:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4ba3f02eabba3350f9ba47c07174816 SHA-1: d8f98e2fb601e4a0d38bcce3713653d6731827dc SHA-256: 712eff5aa150690e64788f2a32a9e8d8ebe316472f3852352ea9cfce36167e96
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary URL, 'https://infrive.ru/pbw?utm_term=price+of+rapidex+english+speaking+book', is likely used to direct users to a malicious site. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or content-scraping attack.

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://infrive.ru/pbw?utm_term=price+of+rapidex+english+speaking+book
    • https://cdn-cms.f-static.net/uploads/4384825/normal_604d6abe6d1a9.pdf
    • https://cdn-cms.f-static.net/uploads/4421339/normal_600de49228143.pdf
    • https://mijeridofuba.weebly.com/uploads/1/3/4/6/134677835/475b23a.pdf
    • https://cdn-cms.f-static.net/uploads/4409623/normal_5fd8825e19267.pdf
    • https://static.s123-cdn-static.com/uploads/4366344/normal_5fe4acb0b9d46.pdf
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/wazemuvutosobudoro.pdf
    • https://static.s123-cdn-static-d.com/uploads/4383165/normal_60afe3313108c.pdf
    • https://cdn-cms.f-static.net/uploads/4407100/normal_60599f6027fc2.pdf
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5ff77a7bec4e5.pdf
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5fc93fef70df8.pdf
    • https://javewadeje.weebly.com/uploads/1/3/4/8/134882586/dirakozidopop_sudelex_vogabug.pdf
    • https://dekupepevimozis.weebly.com/uploads/1/3/0/7/130738652/lonawit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b7a60db0-a11e-43f6-96dd-03fb1ee36eac/ganubamisojijurugera.pdf
    • https://uploads.strikinglycdn.com/files/2d102390-3e4b-4e87-975f-7f0d6b785afa/laxabamewenul.pdf
    • https://uploads.strikinglycdn.com/files/9a0071a6-c495-4281-91ea-e396c2a9bb56/24989901450.pdf
    • http://sajateves.pbworks.com/f/latipidixadi.pdf
    • http://vifogajo.pbworks.com/f/can_you_download_pixelmon_on_minecraft_pe.pdf
    • https://uploads.strikinglycdn.com/files/733c92f7-daad-4d6b-bfb1-060b9610d223/kobexelegepidul.pdf
    • https://uploads.strikinglycdn.com/files/dd85c88d-1f6c-43ff-a945-fce3fc7e5383/xogisebabuvesanadajamofus.pdf
    • http://bemulopawed.pbworks.com/f/what_are_the_best_hashtags_for_tiktok_2020.pdf
    • https://uploads.strikinglycdn.com/files/74ce7157-f7d6-4bdc-adbb-499489a5ebff/wopabizitanozolazijijo.pdf
    • https://uploads.strikinglycdn.com/files/43a16e78-06e2-44e3-8e96-240c6d702532/what_is_software_reliability_in_software_engineering.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_off00010390.bin
f7b677263de4250e31596eae6d1853c00a3bad43e69f3d01e8a46e61a6cc51c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 5688 bytes
font_01_sfnt_off000116e6.bin
10f65e8c035c5ca80354e0b0a5c24281abb137c57c562780e3cb3a737321f1c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 11276 bytes

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