Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f2a5140f8fa5dc…

MALICIOUS

PDF

82.1 KB Created: 2021-03-22 01:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fdad6da145f923acc73cb12209473f5 SHA-1: bf6429ebe90877186096a1b074a3135ff67ee9ce SHA-256: e4f2a5140f8fa5dc6b90c0069b8b637d8812e20d915f20fc452d9d748303bba8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'link farm', directing users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically 'Pdf.Phishing.Trojan'. The embedded URLs suggest the primary goal is to redirect users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=south+actress+photo+with+name
    • https://static.s123-cdn-static.com/uploads/4464313/normal_60017427dac82.pdf
    • http://nigavereke.mygamesonline.org/sukasigijeroligulopaw.pdf
    • https://jepemanek.weebly.com/uploads/1/3/4/5/134589705/kaxomat-govubafawojuw-vimajunapasiz.pdf
    • https://static.s123-cdn-static.com/uploads/4495387/normal_60032d68b247a.pdf
    • http://fulokixowo.scienceontheweb.net/how_to_do_an_interview_presentation.pdf
    • http://falorilipeb.mywebcommunity.org/napopaf.pdf
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/ruvex.pdf
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5fe823d343f66.pdf
    • https://jukatuve.weebly.com/uploads/1/3/2/7/132741058/9964980.pdf
    • http://gebigulexejo.sportsontheweb.net/dosamosumirubamazipunugex.pdf
    • https://cdn-cms.f-static.net/uploads/4490529/normal_6048ecacc0366.pdf
    • https://static.s123-cdn-static.com/uploads/4472188/normal_5fef10ec7dba8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_c7a01d24d9264abbbd7d07627486594b.pdf?index=true
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_91aaa4f4236548bfabccf84bef87c8da.pdf?index=true
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_c87bd50301ed4316a0fbbac22f93db2d.pdf?index=true
    • https://36c533ef-57e7-4b90-8cc4-98798f028392.filesusr.com/ugd/55f640_f905dba5460b4c7b9b916aa8d82b1633.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b9e02aa9-b46f-4c03-8df9-5660734addc2/dyson_ball_animal_2_total_clean_refurbished.pdf
    • https://uploads.strikinglycdn.com/files/dec969f4-931a-4929-bb59-86234198d2b4/driverack_pa2_price.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_1277d8c5817e454aa31d8566bb0f2829.pdf?index=true
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_3ba0cf2130c840a197c313169682e8bd.pdf?index=true
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_1384c64c4f7448d3bc9280383e99f488.pdf?index=true
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_c26617a7550842c687cbe0a141590daa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d2819a92-a87b-4707-bf0a-645c39c56e8e/setap.pdf
    • http://lawaxisagiwog.atwebpages.com/xatasaratuvedopobej.pdf
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_a864cdd63c3548b68d70ed769595c18a.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_6888292747954fc28c3abfe0c8111c0b.pdf?index=true
    • 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_off000103ed.bin
dd1be3735dd1fc1ebfa7a01a09585b07e0e331f3c91ee7cd12b279db1f1138c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 5336 bytes
font_01_sfnt_off00011600.bin
8960d48be1554753e24be0c2ed562b5e136fe9ec29dc9b8209b6bab73e76bb50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 10892 bytes

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