Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8579243a039ced…

MALICIOUS

PDF

73.2 KB Created: 2021-03-15 21:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0abdecf0d44cdc571583f1aa44eda30 SHA-1: dfa2dc5e2c1a8a5823095df26a58e4f9110f5ee7 SHA-256: 6a8579243a039ced22bb62f2038bd86e09447d6422957a0f7cf94d997a1921ed
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://dafemum.ru/wix?keyword=expeditious+retreat+5e PDF link annotation
    • https://cdn.sqhk.co/zovitamojim/Tohhiii/40297677283.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/SShjnNu/neruvafaw.pdfIn PDF document text
    • http://yoptan.space/los_juegos_del_hambre_sinsajo_parte_1_cuevanajrydu.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/eyxGmgg/does_he_like_me_quiz_coworker.pdfIn PDF document text
    • http://carluxepaint.site/dolibevugavasukoze0wdu.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/pusevanavawalogalo.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/nuvosakufopajog.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/gusuzov.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/rCifKia/xudojejebofaxanurapajemin.pdfIn PDF document text
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/walixulidedisefumuwa.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/52498765092.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/32293949356.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/giwidonivewi-lovokewiw-rudenux.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/371525.pdfIn PDF document text
    • http://bufo.online/basic_math_formulasw66ee.pdfIn PDF document text
    • http://topfrag.rip/66702293508ynznj.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/nr0Z6RD/chloroform_water_filter.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/ditiruz/89449124341.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/93109872344.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/34464508522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3c2f11-18af-471b-933c-dbe540cd9f9c/90328867565.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/dodivoribo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a31a9fd-0340-43b7-9076-98002ffaa4e4/kenwood_ts-450s_operating_manual.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/58931389186.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_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 5068 bytes
SHA-256: bc44700a31c03089aaf8ef885ca3322f108fd5da83b3764c88b8aed85a90bc95
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 10840 bytes
SHA-256: 947f2bc5f280950f9b5baac757cfc65d414f5512fbf421acd5387a60506f6473

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