Malicious PDF — malware analysis report

Static analysis result for SHA-256 63632ef4c848fe35…

MALICIOUS

PDF

44.6 KB Created: 2020-04-03 07:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0834ac256f06e06ca4e07bc12fd3f0a SHA-1: f415929972c30c1847414ea81b541ab9ebf685aa SHA-256: 63632ef4c848fe354f8b7b7d4823920ce7ffa83d3421b5e925782013ea549ea7
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade initial security scans. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ciggysound.com/uploads/1/3/0/8/130814515/130814515.html#como+instalar+visual+basic+6.0+en+windows+8.1
    • http://bearvalleymensministry.com/uploads/1/3/1/3/131381497/c232802febfdc0a.pdf
    • http://phoenixwebtest.com/uploads/1/3/0/4/130483043/derana.pdf
    • http://elemporiocancun.com/uploads/1/3/1/3/131380171/getodaga_gozepod_zewuxunevisap.pdf
    • http://tarlifestyle.com/uploads/1/3/0/6/130603822/2561a2df27a64.pdf
    • http://stromberglab.com/uploads/1/3/0/4/130476294/zuwovetig-bedegipixifojaj.pdf
    • http://orchardcoffeeco.com/uploads/1/3/0/9/130969131/dizod_fuwopobibelit.pdf
    • http://bajauncorked.com/uploads/1/3/0/9/130969198/8521d9e0fc27e31.pdf
    • http://obxelectricians.com/uploads/1/3/1/3/131384495/lotenupuwepo-wiwakadewa-poxumovesijuzu.pdf
    • http://skinnova.es/uploads/1/3/0/6/130621131/sofitemujanuwumijava.pdf
    • http://happyhousepreschool.org/uploads/1/3/0/7/130740556/tugadafo.pdf
    • http://ravensroostcreations.com/uploads/1/3/0/5/130588810/manepeke.pdf
    • http://mailproxy2.rampensau.training/uploads/1/3/0/3/130379627/417413.pdf
    • http://snkdancestudiollc.com/uploads/1/3/0/7/130776858/mexagemodufe.pdf
    • http://artfilling.com/uploads/1/3/0/3/130323181/de2e083ab.pdf
    • http://erickreuter.com/uploads/1/3/0/2/130287957/4569883.pdf
    • http://alivenfreedesigns.net/uploads/1/3/0/5/130588347/6148317.pdf
    • http://waynesborodwilawyer.com/uploads/1/3/0/5/130539225/mogeje.pdf
    • http://fairybrandmom.com/uploads/1/3/0/5/130547884/5295640.pdf
    • http://mormon-clothes.com/uploads/1/3/0/2/130271063/lebaguvidilazo-papifevipofevi-pekaxawufot-kulideded.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ee9.bin
4548cb25763e91c64ce585e66e1090cd3f4e6ff861891a496d0451ea51f6f14e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE9 10828 bytes

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