Malicious PDF — malware analysis report

Static analysis result for SHA-256 00830208c7cce2e8…

MALICIOUS

PDF

35.9 KB Created: 2020-05-14 23:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 574e86a4b0c523cff97d56b7e39dded1 SHA-1: c8c83fd282cb5b919c9f6d5e0de9f49d0ede7415 SHA-256: 00830208c7cce2e81578c06450ad2bb878d4682c55686bad8ee7f16e9efb1dab
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files. The ML classifier strongly indicated maliciousness, and the presence of a high number of external links suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://bestsellers-vietnamese.com/uploads/1/3/1/4/131454306/131454306.html#vivaldi++windows+xp
    • http://eleventhstepstore.com/uploads/1/3/0/7/130739635/fupuxujamib_pisuwixifibeb_sufogilufexelu.pdf
    • http://montessoricasa.org/uploads/1/3/1/6/131606146/bajedevam-limisofume.pdf
    • http://congresoprorp.com/uploads/1/3/1/3/131398515/bafd64df6b390.pdf
    • http://luvapy.org/uploads/1/3/0/5/130588698/f1e7a1375.pdf
    • http://hermanosgalvan.services/uploads/1/3/1/4/131453649/getitokadigide.pdf
    • http://galvanizemarketing.com/uploads/1/3/0/6/130621568/dupufalodexexo.pdf
    • http://norskskulpturbiennale.no/uploads/1/3/0/9/130969558/dogovila.pdf
    • http://energyselectrecruitment.net/uploads/1/3/0/7/130775047/aefaf.pdf
    • http://mysanmigueltennis.com/uploads/1/3/0/2/130272557/1ebf4f207c.pdf
    • http://teamhuffmanadoptionfundraising.com/uploads/1/3/0/2/130289179/rivitoxugefofidosabo.pdf
    • http://geotsar.net/uploads/1/3/1/3/131398564/9110314.pdf
    • http://arbuckleirrigation.com/uploads/1/3/0/2/130272241/donexako-fabadijoruxub-pabikonom.pdf
    • http://telleroftales.se/uploads/1/3/0/2/130289638/cfefd7eb.pdf
    • http://paupagotbeats.com/uploads/1/3/0/3/130379814/4043925.pdf
    • http://wiretheworldnow.com/uploads/1/3/0/5/130589121/7075425.pdf
    • http://secondhome319.com/uploads/1/3/0/3/130312976/xofajep.pdf
    • http://luminousplaceproject.org/uploads/1/3/0/2/130289185/1200078.pdf
    • http://midatlanticbusiness.net/uploads/1/3/0/6/130604981/44630c984043b.pdf
    • http://moodmetals.com/uploads/1/3/0/5/130550752/46ce37.pdf
    • http://doggleggmedia.com/uploads/1/3/1/8/131856414/lelad.pdf
    • http://jackiejenkinsstore.com/uploads/1/3/0/3/130323836/8773312.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ec.bin
5d3162275b7d86d347ce545aabc8a1559c35465bdfbb34c368ffe07a8f2d8fee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EC 10208 bytes

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