Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65a37b2089b3735…

MALICIOUS

PDF

87.7 KB Created: 2021-03-14 10:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b0dfa8408ea834097e18f7bd0be7b7c9 SHA-1: d1ea8f024cdb720251be1aefc62d4a994628ad61 SHA-256: e65a37b2089b3735e07c002d8198eca5d4eab1b27939ca0d2b858980c70da5a9
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 pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=emitra+mis+report+kiosk PDF link annotation
    • https://vonizimawat.weebly.com/uploads/1/3/4/3/134385064/gukarula.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/72232995284.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/belly_fat_workout.pdfIn PDF document text
    • http://vienvozvrat.site/pekenexawowot3xgxh.pdfIn PDF document text
    • http://serviceforyou.site/negative_binomial_regression_panel_data_statayxpod.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/6e32bac16e3e3.pdfIn PDF document text
    • http://trylait.pro/xevaravelorasaremetojavz7b5i.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/xififuluwanozen.pdfIn PDF document text
    • http://pycnidwzxc.info/833391175407m3ub.pdfIn PDF document text
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/dagaru.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/40565649116.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/tajekigemigejubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b8b201-75c7-49ee-af3e-9e089f12ff4b/32772047713.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_a51768accd42459e93cb4dcc8f5fbf92.pdf?index=trueIn PDF document text
    • http://zujopafupo.epizy.com/dengue_guideline.pdfIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_fa7de694f44d4ad9b8a5eddddf1b9a31.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_7f5b029e1fd244f98cf977652a90e248.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_707d72cd4f0a4c93bbaa6fbc23d1edd8.pdf?index=trueIn PDF document text
    • http://limixumijegaf.epizy.com/26904880442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab986c7-faa3-4292-8278-99876b600bf0/48809656497.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.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 4956 bytes
SHA-256: 2a004998a4a0bbbe0367626311dd8cb9b7a0f0b258fcc8893968be26dc536220
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 7648 bytes
SHA-256: 5463a1f9f920a2b45b535f4ebdde377aad9c56ba4d3b08e0a2fb1e29c9cc8b78
font_02_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 11596 bytes
SHA-256: 05dc49c802c2461226f4ea5a7aa40efe2fad9b0177e39edf0417bafb0f977d81
font_03_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 5828 bytes
SHA-256: e48434c8b39b118320ab41e5b689de569be877944732bdd881bc0dbe541b7fba