Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27abea624be325c…

MALICIOUS

PDF

35.1 KB Created: 2020-06-13 00:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 991d1c5c68b30eae22b90978c84feec6 SHA-1: b3d3db5e28e982277581977eaa49b10a0bea2f58 SHA-256: b27abea624be325ca6f29aeef3f9ef2dd6ed2e1c33a68d278b06f18799c8cfd3
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 a high density of external links pointing to other PDF files. The ML classifier strongly indicated maliciousness. The document body contains garbled text and metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content or potentially to obscure malicious links. The primary attack pattern involves directing users to a network of external PDF resources, likely for further malicious activity or to manipulate search engine rankings.

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://x0306805xstreamtravel.xsideas.com/uploads/1/3/1/4/131453657/131453657.html#arte+ret%25C3%25B3rica+e+arte+po%25C3%25A9tica+pdf PDF link annotation
    • http://cpanel.sarahssweetconcoctions.com/uploads/1/3/1/3/131379596/0dd3c0.pdfIn PDF document text
    • http://cpanel.storgebhs.com/uploads/1/3/1/4/131453724/7792943.pdfIn PDF document text
    • http://creatutrabajo.com/uploads/1/3/1/4/131407112/d29cf6224076c3.pdfIn PDF document text
    • http://tcp-tcit.com/uploads/1/3/0/2/130289363/jepuzakuta.pdfIn PDF document text
    • http://bikesforall.ca/uploads/1/3/0/3/130323255/ragisajenam_zadolajep.pdfIn PDF document text
    • http://castellanoart.net/uploads/1/3/1/4/131453960/5a1ab0529b9d65.pdfIn PDF document text
    • http://citylandscape.net/uploads/1/3/0/3/130312984/larurepu-bevojexegiwiv-nogazijepobufi.pdfIn PDF document text
    • http://mkh-mfg.com/uploads/1/3/0/4/130489346/suzalefopef-salokowove-mapajeganapup-vidarigor.pdfIn PDF document text
    • http://uslugimonterskospawalniczewarszawa.pl/uploads/1/3/0/4/130483660/pasupekek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dezulav.files.wordpress.com/2020/06/wojapotipubifo.pdfIn PDF document text
    • https://vokizowonaso.files.wordpress.com/2020/06/40308094730.pdfIn PDF document text
    • https://fowomavopil899143489.files.wordpress.com/2020/06/dadumedeg.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

Related samples 3

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_off0000553b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553B 13200 bytes
SHA-256: 84a31bf4a187f32ce27adbaab23a477e1225a9e18c62e6d760561a1348cba1e9

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