Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b90f4ace8ca6e92…

MALICIOUS

PDF

72.5 KB Created: 2021-01-23 06:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 255000ff074f021118f3d39668d5956b SHA-1: 2269a0a6d83da6181a486c80fbdf6e2a0043f677 SHA-256: 8b90f4ace8ca6e92b625e6cdf170fc46561cb40f89bbce92f03bfdc17327ac5e
156 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 S3 buckets and other file-hosting services, suggesting it is part of a link farm designed to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=ciclo+de+vida+de+las+plantas+para+ni%25C3%25B1os+de+preescolar PDF link annotation
    • https://site-1173611.mozfiles.com/files/1173611/23656000990.pdfIn PDF document text
    • https://site-1168354.mozfiles.com/files/1168354/ants_simulator_oyy_meaning.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/6150075.pdfIn PDF document text
    • https://site-1249273.mozfiles.com/files/1249273/videohive_motorcycle_logo_free.pdfIn PDF document text
    • https://xopusetimova.weebly.com/uploads/1/3/4/1/134108877/zuvilisedom.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/3662184.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://s3.amazonaws.com/bisapovepizaj/kalimajuralu.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/zowemonurizoxadurezeg.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/centos_6._4_64_bit_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/famupuvokev.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/filmmaker_pro_apk_android.pdfIn PDF document text
    • http://kadimupekomo.rf.gd/23017030122.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/vudopopapuzijibozuraro.pdfIn PDF document text
    • http://rogitini.epizy.com/minute_of_meeting_template_doc.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/yandex_browser_chrome_extensions_android.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_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 5148 bytes
SHA-256: ad00adfa27601d69a4396131bc3d110085b71ec1de173ec1073c59824fddef4f
font_01_sfnt_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 10496 bytes
SHA-256: 1f6dc97aaaf6f84d034e85b47077a6f465bd4d5076d7bebc579acd836c1c8b77
font_02_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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