Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b4b9705467e7d9…

MALICIOUS

PDF

70.7 KB Created: 2021-04-24 20:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2084b649d93da917fb585829637f4fd6 SHA-1: 9b04e48ef78c17ec796766bc705f85965459f1eb SHA-256: c1b4b9705467e7d908abfbbafb3a6c8ccd85de2cda865845e5f1e68cf716b022
206 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. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://golowaki.ru/strik?utm_term=can+i+check+my+drivers+license+status+online+sc PDF link annotation
    • https://timitadenemegi.weebly.com/uploads/1/3/4/7/134728598/nadesewegigikatisef.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/xusunululaxipe.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/232db54c-6e76-4324-86c4-b631f1078b6a/lazipidabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3cef7c8-703e-4240-adf4-74512cab2407/bixejeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1f5dc5-a9ad-4d13-9ac6-003afc3757dd/navy_training_courses_for_child.pdfIn PDF document text
    • http://wavuxab.epizy.com/lytic_cycle_of_bacteriophage.pdfIn PDF document text
    • http://surewefuwiba.rf.gd/aligarh_muslim_university_phd_application_form.pdfIn PDF document text
    • http://rijujala.epizy.com/nexiladakilituripokuz.pdfIn PDF document text
    • http://semagovolabak.rf.gd/sosamuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe02d7f-c315-4a24-b210-5f11a16a1d0a/introduction_to_amazon_web_services_aws.pdfIn PDF document text
    • http://nebobabag.rf.gd/mutudipidalavate.pdfIn PDF document text
    • http://giditanujagi.epizy.com/subimobosifofega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc5c0d2-6730-464b-ab0d-c918fef65e93/repufim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a0fd49-ae28-4d7d-b883-d703246b810e/41623552386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65513d97-db2e-4e96-a114-0f51e0521485/62855374136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496701b7-62bb-4258-a0cb-9f1034498bb4/29829931422.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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 5312 bytes
SHA-256: e81ad09e328720dd5729566717d485923b6852b9e0cfb3392b0fffe673da9c89
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10600 bytes
SHA-256: 5510d1efaf5eb91918bd2eada9b053074b3881369b5e5119ff9e88ffbb1eb122

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