Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ca2cda48c510f3…

MALICIOUS

PDF

77.3 KB Created: 2021-05-19 22:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c7c1bfc07d1a5e5c88c436f09969978f SHA-1: 794503b3bd4cde9f525f5507efc253ec046612fb SHA-256: 45ca2cda48c510f309185757aea2940a8fb1c6582f5fb5bec95bac14b3de5e5f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

The PDF contains heuristics indicating it is malformed and contains external links, with one specific URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though truncated and partially garbled, references a Discord bot issue, which is a common lure for technical support scams.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://resalured.ru/strik?utm_term=why+does+my+discord+bot+go+offline PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5fe05f1f029a0.pdfIn PDF document text
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/784304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_603b2bddd3461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443356/normal_604927835ae81.pdfIn PDF document text
    • https://tikigafose.weebly.com/uploads/1/3/0/8/130874564/lusefume.pdfIn PDF document text
    • https://kiloxuloje.weebly.com/uploads/1/3/5/3/135398856/5263265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_6000bc3f3bc77.pdfIn PDF document text
    • https://parikijofema.weebly.com/uploads/1/3/1/3/131383717/jonowudubutofevoj.pdfIn PDF document text
    • https://gijepunudadolow.weebly.com/uploads/1/3/4/4/134497403/tomazopawewobuxaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405660/normal_600450b832263.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad3d111-9da9-4d59-87ed-c3483a46a0db/echo_pb_755_blower_price.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/can_inflatable_hot_tubs_be_used_outside_in_winter.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/pomogupazamaji.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/job_interview_questions_for_electrical_engineer.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/jukir.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/answer_the_questions_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/descargar_banca_digital_bod_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/71899478228.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/equifax_canada_credit_report_in_person.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94fa62f9-c30f-46af-b748-c0d657f183c2/zosisoweseketal.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/14067206550.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/login_template_bootstrap_asp._net_mvc.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_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 5480 bytes
SHA-256: 39f5487b9b95dc7d6362a8b689426c4d2ff0750e72db7311bfdcb36c559a1d9e
font_01_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 10900 bytes
SHA-256: 46585ca89150d6b991a381dbd7723f171e6aadaec091331ea09c704682024ea1

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