Malicious PDF — malware analysis report

Static analysis result for SHA-256 d849e23f3e01009a…

MALICIOUS

PDF

74.0 KB Created: 2021-06-09 16:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2e5d552a70a4e6971fb1e2c989098110 SHA-1: ccc8aa9fd4edc7f19b1d38d9417deac217e32da2 SHA-256: d849e23f3e01009a0df669023b9ac3ba29976033d42efc3d242247ce8c92fbb0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://pixomot.ru/pbw?utm_term=best+android+wear+watch+faces+2020 PDF link annotation
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/4648051.pdfIn PDF document text
    • https://vomenipof.weebly.com/uploads/1/3/4/5/134585177/torozoj-mijufidorefomux.pdfIn PDF document text
    • https://wivirupi.weebly.com/uploads/1/3/4/6/134666213/fomomuzaveja-mijojite.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/bajukexagesoweg.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/8125182.pdfIn PDF document text
    • https://pibofarijefi.weebly.com/uploads/1/3/4/6/134648305/fcebae29c8ea3.pdfIn PDF document text
    • https://davufafelasipip.weebly.com/uploads/1/3/4/3/134328138/567330.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/4147969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujefapufefi.pbworks.com/f/81614897812.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144490158/18341514154.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/pobesaxezobokabixeromu.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/f/vojego.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144578688/66916247239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b170be-1741-4d31-8831-cdaad3edfa6c/vanulurumizowase.pdfIn PDF document text
    • http://ravaxes.pbworks.com/f/karavumazarupobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f355b119-019e-4e0a-9a29-5c277d935c90/true_love_quotes_images_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c24cf4-7653-499c-a85d-3f74c38b44f9/how_to_choose_graphics_card_manufacturer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635adaa5-fb55-4ad6-ba69-5bb1ac0f4548/how_high_does_a_glucose_meter_read.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b1d66f3-7678-4758-b4d2-c6346356c1bd/star_delta_motor_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f7511f-398d-4def-ab1c-e613464f8770/what_country_has_the_highest_gdp_growth_rate.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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 5492 bytes
SHA-256: 7f68324b2d695df2fe44617f91d44d5995392166cb216aea9582cb82761213be
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10156 bytes
SHA-256: d5ba76993e37c396fa088fdc79d752abfadafc780201885f1876011aece7f810