Malicious PDF — malware analysis report

Static analysis result for SHA-256 074b1232c9b65302…

MALICIOUS

PDF

89.3 KB Created: 2021-02-25 01:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ed954908ce3f06715b418ad4cb0a93c4 SHA-1: 4c6cdc2221ddde27b04e52f8456f046e9fb193f7 SHA-256: 074b1232c9b65302ef4b220f9b6b66e8a097485d483d5772bbf2de5b406fc566
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One prominent URL, https://jacksth.ru/strik?utm_term=ds2+king%2527s+ultra+greatsword+build, is directly embedded. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=ds2+king%2527s+ultra+greatsword+build PDF link annotation
    • http://fekevopimibun.sportsontheweb.net/marieb_anatomy_and_physiology_10th_edition.pdfIn PDF document text
    • http://tesar-krd.ru/teste_psicologico_de_personalidade9nuve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381528/normal_60020e8e847e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fc68bf8904fc.pdfIn PDF document text
    • https://dejokorakas.weebly.com/uploads/1/3/1/3/131379117/nafirorafunovavu.pdfIn PDF document text
    • http://galoomer.online/pipalet29ub.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/depodibefosegararikuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5fe62507b3f0d.pdfIn PDF document text
    • http://waystep.site/michigan_auto_insurance_law_reform_2019o7t05.pdfIn PDF document text
    • http://ylyn.ru/fate_stay_night_realta_nua_downloadrec79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://bufiziwo.rf.gd/wawopogudanovokelosup.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/52241821729.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/d-link_dir-601_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/latadimes.pdfIn PDF document text
    • http://didejanumaxunef.rf.gd/91229955936.pdfIn PDF document text
    • http://rusogiwelak.rf.gd/79140655705.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/72293941803.pdfIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 5336 bytes
SHA-256: d68813ffdff3c2f21af502502cf8a5c2fb14a9890a94e9610636ccf3244a341c
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10416 bytes
SHA-256: f6833069f7db3155b30c98c84f34a5ae67eefff00b8f2269e8d207eb66ea5696
font_03_sfnt_off000127c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_04_sfnt_off000135c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 9904 bytes
SHA-256: 3a41aa84581a1eb5c481c8ea73e47b041c8f417097686052ebc071dd3617246b

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