Malicious PDF — malware analysis report

Static analysis result for SHA-256 721d886680ba34b3…

MALICIOUS

PDF

74.7 KB Created: 2021-05-31 09:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00892f958cf39154ce38dcfc9751caff SHA-1: 2a4f717cb5b21b4a264d7669f0cca6f56d2db4a4 SHA-256: 721d886680ba34b31355153f2fb3c170733e642abccd8d69a487828e5f7c0f81
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may be used to distribute malicious content or redirect users to 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://static.s123-cdn-static-d.com/uploads/4470968/normal_60aff9a0d248c.pdf In PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/towerizamefisiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_6054c27618051.pdfIn PDF document text
    • https://zaxifugerabapaz.weebly.com/uploads/1/3/1/0/131071175/6012109.pdfIn PDF document text
    • https://tujarabevazedi.weebly.com/uploads/1/3/4/2/134235746/jixej_dobomiwipadazok_ruvar.pdfIn PDF document text
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/lilexinu-wejiwakiboxasel.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/1971335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_603c16a8dab1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_606723ad31867.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/gujegevukajav_zumos_zofun.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/4abb588feb16.pdfIn PDF document text
    • https://sudegefaxir.weebly.com/uploads/1/3/5/3/135323135/6516738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_604dc0ea57a60.pdfIn PDF document text
    • https://jixekibak.weebly.com/uploads/1/3/4/5/134504946/b109afa6415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5febb5c6bfa7e.pdfIn PDF document text
    • https://dowazulipogopu.weebly.com/uploads/1/3/4/3/134322731/5106708.pdfIn PDF document text
    • https://gevoxegugajaber.weebly.com/uploads/1/3/4/6/134668378/xupevowiraj-lasonozumidudej-rovurigufam.pdfIn PDF document text
    • https://punokoguset.weebly.com/uploads/1/3/5/3/135351172/56dcde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=la%20republica%20de%20platon%20resumen%20libro%206PDF link annotation
    • 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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 5456 bytes
SHA-256: ca05397b975f10c43c88b3234ce76248c141c422542501ad9a39b22dfbeeb1da
font_01_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 11268 bytes
SHA-256: 87c7eb2ba8fbff53888c20e6fb1e61d8890693a38229fdc5263266ca8da90979

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