Malicious PDF — malware analysis report

Static analysis result for SHA-256 2963a77ba0e21cb5…

MALICIOUS

PDF

81.4 KB Created: 2021-03-15 05:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 055070fee73c45f0643ba5662eb62d52 SHA-1: 78e90278f7e62517727f4943d3902a99dad75af5 SHA-256: 2963a77ba0e21cb515e9711a407d845e2e85b795c58b0bb02bf4209ba62a8e3a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a large link farm pointing to other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=surviving+the+dust+bowl+worksheet PDF link annotation
    • https://mofizuzu.weebly.com/uploads/1/3/4/3/134316779/gubij_pixorugi_waximevinox_filijaxuv.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/jinesapakoloxujonafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496592/normal_5ff6d0766957f.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/7375336089a70b2.pdfIn PDF document text
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/8862857.pdfIn PDF document text
    • http://lipenav.mypressonline.com/wisiv.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/5177838.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/3026768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_601b847e7d769.pdfIn PDF document text
    • https://gebiralegesexi.weebly.com/uploads/1/3/0/8/130814020/nezofaxejopozufiv.pdfIn PDF document text
    • https://sazexijubix.weebly.com/uploads/1/3/4/5/134599352/mebuta.pdfIn PDF document text
    • https://bobazuforabi.weebly.com/uploads/1/3/1/4/131452976/03aca7.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/vexosafugunu/kalamuwulufosenax.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/rutusilapupoxekelavox.pdfIn PDF document text
    • http://lonesopuw.onlinewebshop.net/rubokozovob.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/the_age_of_sustainable_development_jeffrey_sachs.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/atomic_structure_class_11.pdfIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/2013_subaru_impreza_limited_vs_premium.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/78499771869.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/bracken_ridge_state_school_uniform_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/28677361828.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_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 5336 bytes
SHA-256: 739e3088d3c74b3aa05ab7a46429b6014463ee21c90d94f4f4681d83e0d93527
font_01_sfnt_off00010f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 11536 bytes
SHA-256: 08cf766199776f3a7e44b7dfe4ac088945528bf4f34c2a3cd1b04fa0e490adfb

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