Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd27a04c8766a8c6…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 21:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 068d95e86a798a3ef5e730c8006ddfda SHA-1: 52b64f8023392756188b8b576247065c596d8d01 SHA-256: cd27a04c8766a8c66587a9abf2c08dcfebaf439372bc8b259aa519f2081950c5
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 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=braun+digital+ear+thermometer+reviews PDF link annotation
    • http://coolvdomaion.online/design_and_analysis_of_algorithms_notesgomqs.pdfIn PDF document text
    • https://cdn.sqhk.co/tovitaxani/fgejeid/apprendistato_part_time_e_ore_di_formazione.pdfIn PDF document text
    • https://bawokotofebadu.weebly.com/uploads/1/3/4/5/134507933/ffe32c0d0.pdfIn PDF document text
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/wirakenupawajibulok.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/why_is_there_a_jumper_wire_on_my_thermostat.pdfIn PDF document text
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/tazow_xigixewamazowek_siwalowodijin_lusapopo.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/kubegekijonaf.pdfIn PDF document text
    • http://cheapkeys.site/bowflex_xtreme_2_specsoa2at.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/55jfn4U/ruwepegejolowefori.pdfIn PDF document text
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/ribobo.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/6KihIgg/82115308470.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/03Fly1E/electric_pro_li_outliner_clippers.pdfIn PDF document text
    • https://zalekekowijix.weebly.com/uploads/1/3/5/3/135346798/9494704.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/fuvesekewutafogujaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/solonebosop/lomusute.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/xodovoj.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/6025091775.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/surf_report_oahu_north_shore_today.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/python_enumerate_string.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 5440 bytes
SHA-256: e3666ee96053d28d8fd23a8d581e8c990da038e300c687e9bac255529dba3db7
font_01_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 11176 bytes
SHA-256: 0a621553e3f3f521d2dac8817630211afcae2914e9f806ddf5071ba915e93b95