Malicious PDF — malware analysis report

Static analysis result for SHA-256 b777655ecbccf8ee…

MALICIOUS

PDF

64.8 KB Created: 2020-12-17 06:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 84ef6ba511417a87c2a6de4b0972f9bd SHA-1: bc15ae5b50887f211f286d1f71e3d7c61baeb9f7 SHA-256: b777655ecbccf8eea2ee401ce4fdcb80772d200784ad847ccd70b5641ef309ba
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URLs suggest an attempt to direct users to potentially harmful external sites, possibly for phishing or SEO manipulation. The ML classifier and ClamAV detection further support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=enrolled+agent+salary+florida In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f915ec12d15a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fa6dde2a860d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5fd128a06d8ea.pdfIn PDF document text
    • https://libesomed.weebly.com/uploads/1/3/4/9/134904451/zaxokupekujolot.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/jonojogoku_nutiwilaxumenom_dumogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f9bf3ab36589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459325/normal_5fa915d7c9f7d.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/juliziwojatige/bhagalpur_ka_station_platform.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc325ec9955c744b54a24d6/t/5fcd946b6f0099009e7dd7d2/1607308395481/direzamejusuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/72647395738.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/void_opal_mining_guide_elite_dangerous.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/bcbs_il_medicaid_appeal_form.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_off0000c182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC182 5136 bytes
SHA-256: 8451953b86fb5bdfa687dd875b3d3f2761f9ba7d3672785e13cb7f34eb6edbb0
font_01_sfnt_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 10484 bytes
SHA-256: 04c83d223ebd8848e6e6bbc875aab38e7265faccfba13fbfe195fb7698e5e157

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