Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab759ce99b171e83…

MALICIOUS

PDF

78.1 KB Created: 2021-03-09 22:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b1ce36ced8f010c34dd8533a97d98336 SHA-1: 55eacfce307305cbf1661cbb0bd7db4cdcccf31a SHA-256: ab759ce99b171e837f087c051bfe4547752b9df16a78778b82b69bb6fae42020
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=karlie+guse+instagram PDF link annotation
    • https://cdn.sqhk.co/jojojidatun/hdgcgha/xufokemeleremonuwu.pdfIn PDF document text
    • https://rukagevilatixa.weebly.com/uploads/1/3/1/6/131608017/jiguzix.pdfIn PDF document text
    • http://joloromodosafor.22web.org/momapufovevabofemab.pdfIn PDF document text
    • https://jowojebutoda.weebly.com/uploads/1/3/4/4/134487303/7218955.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/kduS7gh/king_s_empire_apk.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/4211584.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/bEgjage/41930402562.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/pakozudefukara.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/Fz1TGhb/age_of_war_3_unblocked_hacked.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/cb468fef117.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/jcVN1Gk/40916473578.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/zinegiv-viwivutatukegu-linulaxexidat.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/whirlpool_cabrio_washer_error_codes_ul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazigolukujo.epizy.com/does_uppababy_mesa_car_seat_come_with_base.pdfIn PDF document text
    • http://tabojid.epizy.com/safeline_metal_detector_wiring_diagram.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/sijuk.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/43942819862.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/dual_luciferase_reporter_assay_quick_protocol.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/jbl_flip_3_bluetooth_speaker_watts.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/62138593034.pdfIn PDF document text
    • http://nibimasumexugi.rf.gd/html_css_templates_simple.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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 4976 bytes
SHA-256: 52459f51e97ee4e6b6bc66cfdf7b0ef7f82447928ae3ef02e613143030330920
font_01_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 10236 bytes
SHA-256: caad46d52f33697e8c5f59b526c3935962ee1f6484bf04358eaccb5aacb45a89

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