Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bcccab3927a6b2…

MALICIOUS

PDF

78.7 KB Created: 2021-06-02 13:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 24dd3d118fddc3f51e1384c5ce98a977 SHA-1: 624e6b846e56d6a6e5a2e7b74e74fb35e4549452 SHA-256: 44bcccab3927a6b205c1659d8dc5869439ea1aa1b5e992c3fca122b1f1c2f8b2
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many of which are on disposable hosting and utilize UTM parameters, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/pbw?utm_term=bangladeshi+new+album+hd+video+song+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497095/normal_60171e0fe76ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5fd3d5dfbb4da.pdfIn PDF document text
    • https://pikofejuja.weebly.com/uploads/1/3/4/4/134478885/90ef91c991f5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_60313e9ab2b84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418579/normal_6003a5ca2f2d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_60117d6787f78.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/noriwi-jegew.pdfIn PDF document text
    • https://subafoxa.weebly.com/uploads/1/3/1/3/131379179/2038116.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/6f81ed9d-c0e9-43eb-bacb-562c00ddfc6f/titration_for_acetic_acid_in_vinegar_lab_report_assistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a6bc09-6004-416a-be47-db7e9faf146e/kivogokixupevateg.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144414627/78988878861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea0dca3-c87d-4e80-adff-fac1a352ad3d/vumebitajibakumut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bda8f6f-c46c-4d69-b76a-2bb215785e9e/black_powder_red_earth_rifle.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/zapafejapexefeteso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03b5249-b3d7-4797-86e1-c13c268bcaa3/88769947930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17146212-1de0-4d3b-a4cd-dc47493fef78/56176526844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28817ae7-8aea-43fd-977d-dc66b7b713b7/55073240453.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144500754/prueba_moss_respuestas_correctas.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144470382/carlo_maria_cipolla_allegro_ma_non_troppo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b42c6a5-2678-4f58-89e6-4afcc09d4cab/riritupaf.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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 5484 bytes
SHA-256: aaf9f80e9f08c7f1c56477a1debc14bb31b1ee46521350d9f45b92402e06ca90
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 10596 bytes
SHA-256: 992e45ca7a5d1aefcc08ae0bdcf830598d43b8a35d9e627110ae28ee37b55fc1