Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbda04d11cfcd56…

MALICIOUS

PDF

82.5 KB Created: 2020-11-17 17:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: af621903ba946cb1c03257050eb22eb4 SHA-1: c379881e2da1658fc93200f04fae649190e38c02 SHA-256: bbbda04d11cfcd569e983921a3395238333ee92a8628f165acfe8bc98c0283ad
244 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/123?utm_term=hpi+savage+x+4.6+spur+gear In PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/kesarimota.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/257577.pdfIn PDF document text
    • https://daxuferawul.weebly.com/uploads/1/3/4/5/134592581/falomura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5f9ae0c48f3b3.pdfIn PDF document text
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/kodiv.pdfIn PDF document text
    • https://kegibaxita.weebly.com/uploads/1/3/4/6/134661687/zanikovekiso_ripuduwex.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/54a7112e-1e6f-4d1a-adcb-4fc11a532418/burtonsville_elementary_school_md.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4511855a-1a57-4585-93d8-cc99da8c9ea1/davabividajuvalojakira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4f1530-be39-4704-9ec7-673af63d84d9/goa_tourist_map_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d930e172-77e4-4313-bc6c-6c2cb7c38601/outlook_com_sign_in_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e399f392-40ab-4f7c-96f9-8ea3a847ec52/siwedixapobixinozu.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/are_molluscum_warts_contagious.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/automatic_potato_peeler_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe81885c-14c4-41a6-b964-988d7167b4a3/88102060668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e20a917d-d7a5-4c5a-861f-db28b656fdde/mathematical_methods_for_physics_and.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_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 5320 bytes
SHA-256: 5f43ba2f4e8c5f9594c9230287c712e9a6ade658cd6aa03c08d4303e8ad0aa60
font_01_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 15652 bytes
SHA-256: 0ad1bde6054469f881a11cff57569cf97e9a731f7a149e3981754a83d4c2e200

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