Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d9229bd7ef442f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-09 10:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a5f13dbd9041bc3ea3e9b69aff32723 SHA-1: 56c2e95f72bfe9d79952c5cbb25b7c1c3258d103 SHA-256: 44d9229bd7ef442f8773339b1d4be9789ee51578a12911d66aa6f1e4fdd12f6e
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The presence of a large number of external links suggests a link farm or a method to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malicious content distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=black+and+decker+rice+steamer+instructions
    • http://jotaxanalesuti.iblogger.org/blaque_808_remix.pdf
    • http://nokutanebufevon.iblogger.org/how_to_reset_yale_smart_lock.pdf
    • https://cdn.sqhk.co/zaniridut/D4giicJ/82457285047.pdf
    • https://cdn.sqhk.co/tatiderubota/jedibqU/44230020689.pdf
    • http://tideparipawovu.mygamesonline.org/kusakadebowasit.pdf
    • https://cdn.sqhk.co/goxupolofodi/fDtUTVV/89100906474.pdf
    • http://zofanelo.22web.org/fiman.pdf
    • http://zajowidased.iblogger.org/edhesive_2._6_code_practice_answers.pdf
    • http://nububezobuto.22web.org/85184086063.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_274dfc23d5944c5bbd7e0afb3e54b070.pdf?index=true
    • http://koxepari.rf.gd/zujalelapokerodidejulelam.pdf
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_ebad504a93bc431fbb12c60bd61327ac.pdf?index=true
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_e2133cc6ccdf43c89b1970ca5477e031.pdf?index=true
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_c97086bebb854cfeb3256fcc0ab70778.pdf?index=true
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_645c208c75864ba2aa8939196ad8456d.pdf?index=true
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_d417679ae7014e7ba2925091eefa2151.pdf?index=true
    • http://zowofiz.myartsonline.com/is_financial_modelling_course_useful.pdf
    • http://fogovulosuzan.onlinewebshop.net/lasibuvutador.pdf
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_7ff751e2b2c344f795a1f7a5e4fcd607.pdf?index=true
    • http://juxudawalugevop.epizy.com/datiles_informacion_nutricional.pdf
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_7c4340a21a6d4a08ae95d75c02647ce3.pdf?index=true
    • http://vutekumini.epizy.com/62415260673.pdf
    • http://moretavumafoge.epizy.com/epf_withdrawal_form_19_old.pdf
    • http://gipizaz.rf.gd/wejos.pdf
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_8d7fdaa791c84c359e7b222e69f25e65.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_off0000f915.bin
25e4934473e08c4236dd3c9c50ef04e025cbf2ded181dea7eadd83ed424cc907		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 5200 bytes
font_01_sfnt_off00010aac.bin
bf6b1c4159e19a13bb1defccc53598084685e5cd889fd61ec3d5071cc1f1cea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 10596 bytes

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