Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bba0d5c5e923a40…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 20:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0352c8a36f4fd1e82fa1c547d1c2deb1 SHA-1: 92455e3d4d9cc3f5148bdc59f96a83ffe5f21bb0 SHA-256: 4bba0d5c5e923a4051fdf5dd40a39d278812a1af4fb4f82ea0f18a16bd8ed574
186 Risk Score

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 0.9997

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
  • 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://gimoguvi.ru/strik?utm_term=why+is+my+hardwired+smoke+detector+blinking+red PDF link annotation
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/3200745.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/6520119.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/kamuxubono.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454677/normal_6006849f0e411.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/7131203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5ff45dfa6cbfd.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/fire_and_ice_melrose_arch_buffet_menu.pdfIn PDF document text
    • https://ratofesut.weebly.com/uploads/1/3/5/3/135304008/1ec3b9b6f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd7d9b059576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3fd7c84f-54d0-4fb1-874c-bbcd665cefda/buku_plato_timaeus_and_critias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a045d5cb-a50e-4d89-90b7-3300c26bdf4d/what_warning_does_the_nurse_give_romeo_and_why_do_you_think_she_does_this.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_2c66417e69704ac4871f80a3d2222881.pdf?index=trueIn PDF document text
    • http://negumigimewote.onlinewebshop.net/moledabiwowozifunonixira.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_5570c4d8fd524caa94407667488972e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5eee13-e320-4480-ad1c-fdd8f793dfbe/skipping_christmas_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea873f0-c33c-42ec-ba86-a3cb79eb3d32/how_to_put_filter_in_brita_stream_pitcher.pdfIn PDF document text
    • http://buxodanukesidup.epizy.com/autocad_2013_link.pdfIn PDF document text
    • http://tofalit.myartsonline.com/jonuzuzirowumokotoro.pdfIn PDF document text
    • http://rolugume.rf.gd/makolowuxatujaretuvas.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_9679ded6c1cc45fa8f2d9e03198deb64.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 5552 bytes
SHA-256: 462e07056e17d9facc5e11fa89f4910677409b1da7fe56331a78df221ed8a157
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 10964 bytes
SHA-256: f56e7447e041d011d07bdeb65aeb2a66c233f7815a41b12162f1c5df96dbbb64
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3