Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b83f28a3c3ac986…

MALICIOUS

PDF

76.7 KB Created: 2021-05-15 09:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a4e8b465d9fb6f5e35cb3f72e0dc93e3 SHA-1: e7b7bdb0d744b1bf01f38fb4bd5f18a49350ea7a SHA-256: 1b83f28a3c3ac986e49ce55805c4f74be6d7990255ae2003dc88393b707f2729
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious document, including a high ML classifier score and ClamAV detection as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to its creation, and the presence of embedded URLs and a password-protected archive lure indicates an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mezovuduw.ru/strik?utm_term=dutch+oven+cookbook+pdf PDF link annotation
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/1850060.pdfIn PDF document text
    • https://dorulitonen.weebly.com/uploads/1/3/1/3/131380258/zatorapur.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/icggijG/kevon.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/yV39fhe/42459584430.pdfIn PDF document text
    • https://jaxifojuw.weebly.com/uploads/1/3/5/3/135351184/sufexinuwumez_givexerisereta_mirut.pdfIn PDF document text
    • http://lishop.site/craftsman_cmew213_manualqvf8m.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/kMjcghR/jodilodogus.pdfIn PDF document text
    • http://teasmall.space/178683082834wyxv.pdfIn PDF document text
    • http://ampinternational.org/ximifisubelikunasv6b1x.pdfIn PDF document text
    • http://redita.fun/pharmacotherapy_a_pathophysiologic_approach_11ehiyoy.pdfIn PDF document text
    • https://vixubarurumufov.weebly.com/uploads/1/3/1/4/131454397/6732324.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/hjMgjjd/klondike_solitaire_download_for_pc.pdfIn PDF document text
    • https://fivakamine.weebly.com/uploads/1/3/4/3/134384559/bafufeluroluzu.pdfIn PDF document text
    • https://dekamukovesu.weebly.com/uploads/1/3/5/3/135324216/d9d60f3d8.pdfIn PDF document text
    • https://wuruderow.weebly.com/uploads/1/3/5/3/135389815/aede20.pdfIn PDF document text
    • https://sasanufodokedu.weebly.com/uploads/1/3/0/9/130969760/kibiwigasuwit-jelabadozo-kesesinu-wiwapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_a53b9fd87ba24a99bb7929331a419881.pdf?index=trueIn PDF document text
    • http://zuxekesimulir.epizy.com/calendar_2018_week_numbers.pdfIn PDF document text
    • http://vemevusakeke.epizy.com/nolajuwekajaga.pdfIn PDF document text
    • https://b993c520-4fc9-488d-8dda-35d8b3dc2713.filesusr.com/ugd/6f5492_ad99e8f3c5a6402a92c2e314ddd9c909.pdf?index=trueIn PDF document text
    • http://jabizamok.epizy.com/kaxadewuzawujuzuvenimigiz.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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 4992 bytes
SHA-256: 566364cf548fab948c50e0e02515d8270307cbd4b2172e0dd239595de10c3a25
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 11028 bytes
SHA-256: 1ed362aa83789d47e993a1db678586d176980f38097bf7e7c4b0a03d11d000fa