Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce406eb54be33077…

MALICIOUS

PDF

55.3 KB Created: 2020-04-02 22:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 5aefbe6a16ac713568fa76e90dcf984b SHA-1: 1efa6069a1026f1ea9186e503fa6367fb962ab10 SHA-256: ce406eb54be33077a1fe68de4d9a1b77a758c33c051bfdee2776bee5437f6032
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact lure. The primary attack pattern observed is the mass distribution of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://hyperdrivehistory.com/uploads/1/3/0/2/130289651/130289651.html#programa+de+computacion+para+primaria PDF link annotation
    • http://unblindedstore.com/uploads/1/3/0/7/130775172/08403c1.pdfIn PDF document text
    • http://thefieldofpossibilities.com/uploads/1/3/0/7/130738974/13a2d9ba.pdfIn PDF document text
    • http://jamorrowfreeman.com/uploads/1/3/0/6/130639465/c13bedaf4d07.pdfIn PDF document text
    • http://hostmaster.vakantiewoningakkerwinde.be/uploads/1/3/0/4/130436018/semuxuzab_rofim_lexovosaz.pdfIn PDF document text
    • http://picassolovechild.com/uploads/1/3/0/7/130775242/basiwimisufex.pdfIn PDF document text
    • http://brotherjohnbookorders.shop/uploads/1/3/1/1/131163690/86e6d51a.pdfIn PDF document text
    • http://perfectstrangerphotography.com/uploads/1/3/0/7/130775610/jitix.pdfIn PDF document text
    • http://antiviruseonlineprotectservice.site/uploads/1/3/0/6/130620395/vajaguk_rubopulevub_nurusebarale_sagese.pdfIn PDF document text
    • http://georenewal.org/uploads/1/3/0/6/130639792/mifodaxezubesiz_taladav_redig.pdfIn PDF document text
    • http://quantockpetequine.org/uploads/1/3/0/2/130291463/vifodupomobog.pdfIn PDF document text
    • http://www.nayibbukelepresidente.com/uploads/1/3/0/3/130379126/54dcab36ad.pdfIn PDF document text
    • http://drisenproducts.com/uploads/1/3/0/3/130313180/fapemivezan.pdfIn PDF document text
    • http://brooklynnativez.com/uploads/1/3/0/4/130488604/3954ccc.pdfIn PDF document text
    • http://wishbonesje.net/uploads/1/3/0/4/130489926/920195.pdfIn PDF document text
    • http://www.gnostisisme.org/uploads/1/3/0/4/130483875/0b7f9.pdfIn PDF document text
    • http://mobilemechanicbasildon.com/uploads/1/3/0/5/130551338/dimuketasifizomepe.pdfIn PDF document text
    • http://howwastomorrow.com/uploads/1/3/0/4/130488227/fokorituni-bijegep-leverafugi-vobomovome.pdfIn PDF document text
    • http://matankorin.com/uploads/1/3/0/3/130323417/xemoxut.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E6 1544 bytes
SHA-256: b095009e1aa7b679086a2dd093949a1e2bfdfa179c83d9e64a20210f199a406d
font_01_sfnt_off0000ad56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD56 9340 bytes
SHA-256: d4c04ed31b4f44b2b48c5255962fc061a21d5da8a4044db85a0019e98f00c4ae

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