Malicious PDF — malware analysis report

Static analysis result for SHA-256 b943f7550118ce4e…

MALICIOUS

PDF

84.6 KB Created: 2021-03-14 00:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e2917f24364bd1d5415bd297e4556482 SHA-1: c237138ccbbad7802fa155abe459687ebad1b83a SHA-256: b943f7550118ce4ea24a06863e9e593a946f8b532bd03930eda847d81d17b11e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. The presence of a specific URL related to an 'Epson wf-3640 error message 0x97' suggests a lure to trick users into seeking technical support or troubleshooting information, leading them to potentially malicious sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=epson+wf-3640+error+message+0x97 PDF link annotation
    • http://dedezitomurepu.iblogger.org/chemistry_unit_conversion_practice_worksheet.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/16204620785g1swb.pdfIn PDF document text
    • http://efarbok.xyz/bobuvec79u7.pdfIn PDF document text
    • http://fezanabuxa.22web.org/19688849574.pdfIn PDF document text
    • http://begetus11ppz.xyz/62656426365u6ixe.pdfIn PDF document text
    • http://idealslimitaly-official.site/amplificador_sony_xplod_xm-2200gtxyahio.pdfIn PDF document text
    • http://jakafat.22web.org/manual_citizen_eco_drive_skyhawk_blue_angels.pdfIn PDF document text
    • http://mivetys.xyz/present_simple_and_present_continuous_explanation19qaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_0a3290e6690148468bdf100593810a8a.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_3d547f078ba3478fadea4913c4107b0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e87465-0a9e-41ed-bf4c-3003381854bd/common_core_math_problems_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7c9df7-0f20-404f-a6ae-43b0e97a6054/how_to_change_the_filter_on_a_rheem_classic_90_plus_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043057c7-9814-4517-ab32-a86947c06758/how_we_decide_lehrer.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_e9d2d6dd39734f7cb4c65b4669435886.pdf?index=trueIn PDF document text
    • http://wukafomiweseb.epizy.com/3290539396.pdfIn PDF document text
    • http://molezegifa.rf.gd/tunenuvebo.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_fcc6ba755c8e4c9c91fc4817aac444b7.pdf?index=trueIn PDF document text
    • http://vizebafep.epizy.com/samples_of_argumentative_essay.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_f5cd8df6832e4715ac571c52a85d6273.pdf?index=trueIn PDF document text
    • http://vazorilumi.epizy.com/sample_magazine_cover_template.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_95b5f71befdc4f1d9341d3aa59ed1885.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_70009730e5954209816f704a74aebbc3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 6124 bytes
SHA-256: a6ebf2d369a3348f4939f78120e47739fad8c1749e1ded58f6737862b638c200
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 11592 bytes
SHA-256: d9e7d4b89ee45bcea3a2e9fde46aadacfdb606d8c801a26d96fc09b4d98a15cc
font_02_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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