Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea4aeefee51679b…

MALICIOUS

PDF

33.3 KB Created: 2020-05-15 23:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 4531827982aa4858ebb65a5cbbbc6568 SHA-1: 954f8a065af5d1ae0317c42d49ce00207187f360 SHA-256: 3ea4aeefee51679b398e881b0219170bc59fb1234a8f4a5a1f84e7a6a65673bd
136 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF documents hosted on different domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text related to a school report and the authoring application, which may be used as lures. No scripts were extracted from this sample.

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://speelkoning.net/uploads/1/3/0/6/130621116/130621116.html#netherton+moss+primary+school+ofsted+report PDF link annotation
    • http://dcccorp.net/uploads/1/3/1/3/131398140/a32a4c16fac61.pdfIn PDF document text
    • http://ltylogisticaterrestredeyucatan.com/uploads/1/3/0/9/130969037/lepitelibopovez-lizoxigiwopi.pdfIn PDF document text
    • http://garrywileymcclendon.com/uploads/1/3/0/2/130288533/4257143.pdfIn PDF document text
    • http://rockgardencafewtn.com/uploads/1/3/0/5/130550848/4249266.pdfIn PDF document text
    • http://ddhaughtinc.com/uploads/1/3/0/6/130604653/jebifigilevulupe.pdfIn PDF document text
    • http://rungcustom.com/uploads/1/3/0/5/130539182/sefaxixikiru.pdfIn PDF document text
    • http://theangelinsider.com/uploads/1/3/1/6/131637701/21da49.pdfIn PDF document text
    • http://yndiramagicgiftsandballoons.com/uploads/1/3/1/3/131384142/rowegifuwe.pdfIn PDF document text
    • http://impactphoenixcup.com/uploads/1/3/1/6/131637016/wolupigomepej_fonapufir_milax.pdfIn PDF document text
    • http://truthlifestyleco.com/uploads/1/3/1/3/131384468/176054ec57eb5de.pdfIn PDF document text
    • http://pkflash.org/uploads/1/3/0/7/130738940/telovij.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56E7 10192 bytes
SHA-256: 939c66f5945c3ab76494fefd4ea7869c3df77c4fca51050ec1e9954a0b0a046d

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