Malicious PDF — malware analysis report

Static analysis result for SHA-256 81152d384409d284…

MALICIOUS

PDF

82.3 KB Created: 2021-05-05 15:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 90a3d7394f17544bfd5a4c66f719703b SHA-1: 843a8591ba1168cb80bb9c3f23fa116484dcc9a1 SHA-256: 81152d384409d2847e97739afbf5549c7da5f1b476dba5982d0c3df3df8073fd
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=que+es+un+taller+educativo+seg%25C3%25BAn+autores PDF link annotation
    • http://rirenanevigi.22web.org/56799167742.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/Vvkt5iA/dutokuwakiripolakej.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/jb6gfjc/caregivers_home_care_rochester_ny.pdfIn PDF document text
    • http://pabufit.22web.org/chunks_full_movie_malayalam.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
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_fc0d0b2174b24b23893be97b7b06cb20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivamubug/2000_jeep_grand_cherokee_misfire_problems.pdfIn PDF document text
    • http://lodusebivepakef.epizy.com/muziladufetamoxivedadaj.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_c450e14e07e845289277bc887d3be979.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/sixejaja.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/44706342483.pdfIn PDF document text
    • http://turolikuzadera.epizy.com/android_tablayout_example_using_viewpager_and_fragments.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/michael_kors_shoes_size_guide.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_ce4866f03586400d8b6d658b64541979.pdf?index=trueIn PDF document text
    • http://milazadizuwi.rf.gd/gixevunexeredoguwe.pdfIn PDF document text
    • http://jozeratajugik.rf.gd/toshiba_satellite_l755-s5216.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_8a7cc197732f45e8b64637b9c7916c14.pdf?index=trueIn PDF document text
    • http://fosarasopu.rf.gd/geometric_distribution_proof.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_e1c996f4613f443288d56884085af57a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widofafane/getelodofijanafufujob.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/baltimore_classification_of_virus.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 5228 bytes
SHA-256: 0314a9cee33974c3814f35449595b4dfab1af2e91b9f3367dfe77ad2f814304d
font_01_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 11504 bytes
SHA-256: d2e1f4db45e2e7cfedd8dbbbff0b73f7ac9a60a80bcfd24c250b0e1ba7f11072
font_02_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.