Malicious PDF — malware analysis report

Static analysis result for SHA-256 940c0a28d9c2ea4a…

MALICIOUS

PDF

75.2 KB Created: 2021-05-27 04:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e0cb6097028e6fd9f6dc48aa9cfd9335 SHA-1: cd9500bf8d00f16e5337357a1eed7224b030da78 SHA-256: 940c0a28d9c2ea4a174d3b7a4b078971a7cb7a2dc488357ec1245d8a7e612574
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, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=the+giver+chapter+summaries+20-23 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490754/normal_6014711516cf2.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/madobojo.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/f17592dbc667.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/4b0acc.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/watexuzep_volezijam_fubozupu_vetumag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_606d68d546251.pdfIn PDF document text
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/bobinapid.pdfIn PDF document text
    • https://paxixikepidak.weebly.com/uploads/1/3/4/6/134666626/wejiwojafol-zebesizipijes-fojikot-rasimozuzixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_60677d1eb3e47.pdfIn PDF document text
    • https://bodarisijusafu.weebly.com/uploads/1/3/5/3/135383154/jiwumimur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_5fca4b8b5a613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5fce958a6440f.pdfIn PDF document text
    • https://sisasava.weebly.com/uploads/1/3/0/7/130738988/diduginober-febikezot.pdfIn PDF document text
    • https://tenekivosorudo.weebly.com/uploads/1/3/4/5/134596066/95eb4e3.pdfIn PDF document text
    • https://bukolugupizokaw.weebly.com/uploads/1/3/4/8/134862081/368526.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/lufiwi_rusibutiwa_bogegi_lakefori.pdfIn PDF document text
    • https://xokojitijuxup.weebly.com/uploads/1/3/4/3/134362284/nozipixovabep.pdfIn PDF document text
    • https://sowupetu.weebly.com/uploads/1/3/0/7/130739285/fa7330e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_6036c366ed3f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456393/normal_5ff598855619b.pdfIn PDF document text
    • https://keziputaxa.weebly.com/uploads/1/3/2/7/132711938/wazijigitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5ff26c8500e1e.pdfIn PDF document text
    • https://xuxijirabof.weebly.com/uploads/1/3/1/4/131406659/5dbb887870.pdfIn PDF document text
    • https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/6945949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 5792 bytes
SHA-256: 54d473c486b1d0b334d0a34390b5d3d953f39c10851db8af5d52dab376eb3a36
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 10452 bytes
SHA-256: d00670171355f62a7bc95827a3cc18480fd97dfab1ce4ca51d4a90f4a35c9d9c