Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd45e235fc78950…

MALICIOUS

PDF

74.4 KB Created: 2021-06-08 20:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e1becff85bf3e74beb9139453f3d0806 SHA-1: 812721ee7b93e8a189736ffbe00599763328a8ca SHA-256: 9bd45e235fc789506a0d0ca76eab0e538810f9a23dcb7d14a150bd8b47b3db8b
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 of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/pbw?utm_term=fortnite+free+ps4+account PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4468814/normal_60b2b4eccaaab.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/7343814.pdfIn PDF document text
    • https://wakazezoloke.weebly.com/uploads/1/3/3/9/133999839/tixuxuzefemugefamod.pdfIn PDF document text
    • https://gajabalavira.weebly.com/uploads/1/3/5/3/135347595/dosozudugono.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465267/normal_60b3c05d08fa8.pdfIn PDF document text
    • https://bazulezegit.weebly.com/uploads/1/3/4/3/134372971/luxexopatuvem.pdfIn PDF document text
    • https://pedudevapo.weebly.com/uploads/1/3/4/7/134719514/be73a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455876/normal_5fddd8620e462.pdfIn PDF document text
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/pomej_nagirolovadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_60699f45c762c.pdfIn PDF document text
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/visomojik_jadapevude_tobewufotuf_kixuxibud.pdfIn PDF document text
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/mujemeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_6041764300c45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_605ffe8bc4b73.pdfIn PDF document text
    • https://jevulifed.weebly.com/uploads/1/3/4/4/134457796/7415479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_6029205fdb9ff.pdfIn PDF document text
    • https://reragoposezexel.weebly.com/uploads/1/3/5/9/135958934/e69b12362d64d7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowenoxo.pbworks.com/w/file/fetch/144883095/unguided_transmission_medium.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144496581/38240767833.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/what_to_write_in_a_one_year_anniversary_card_for_my_girlfriend.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/f/93492934065.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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 5020 bytes
SHA-256: a28e6655b43261bdf18c2efb304d16bad131d7a77d5356ca7dca329d4ef63517
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10404 bytes
SHA-256: 909a5b41762421e385264b4078f54dec66aa7e5f07b8b1db5ab7b02c64b1303c