Malicious PDF — malware analysis report

Static analysis result for SHA-256 43349fa93fa68d14…

MALICIOUS

PDF

44.4 KB Created: 2020-03-25 04:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df5c68532d4e2751fca59034dabb5364 SHA-1: e1749fbc326f459e1fa4f84637fffd9b95322637 SHA-256: 43349fa93fa68d14191553c0ec10b193589e4649cd9093ecf81ba9f7bb603b50
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains. The document body text, though partially corrupted, includes a Spanish phrase related to 'video of the SEO system for children', suggesting a lure. The heuristic 'PDF_SEO_LINK_FARM' confirms the presence of mass external PDF links, indicating a likely SEO manipulation or content distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://oakclass.com/uploads/1/3/0/6/130620955/130620955.html#video+del+sistema+%C3%B3seo+para+ni%C3%B1os
    • http://sarahsavers.com/uploads/1/3/0/4/130435729/zijumutu-gewazabofim-kezuvikaparuguz.pdf
    • http://www.diskyoto.jp/uploads/1/3/0/4/130475909/5558954.pdf
    • http://teddysintel.org/uploads/1/3/0/7/130775730/vatudeseru.pdf
    • http://theskinnhaven.com/uploads/1/3/0/7/130740128/5118447.pdf
    • http://happyweedfarm.com/uploads/1/3/0/6/130639889/dafefigogolazem.pdf
    • http://2recommend.online/uploads/1/3/0/4/130492127/raribi.pdf
    • http://creamridgeswim.com/uploads/1/3/0/6/130621483/birimelav.pdf
    • http://annalyzethat.com/uploads/1/3/0/4/130483542/miwixepizafen_fukepineluza.pdf
    • http://gradyworld.org/uploads/1/3/0/4/130483614/zimukaxok.pdf
    • http://bigloser.com/uploads/1/3/0/6/130620266/111168b509b9.pdf
    • http://www.tonykoros.com/uploads/1/3/0/2/130274376/9323107.pdf
    • http://archimmo.ca/uploads/1/3/0/5/130550704/4102574.pdf
    • http://cobex.fr/uploads/1/3/0/8/130814241/govidirideb.pdf
    • http://christinecarson.net/uploads/1/3/0/5/130543462/8755cd8.pdf
    • http://www.lilpurdy.com/uploads/1/3/0/6/130620483/9894679.pdf
    • http://rivertoriverparanormal.com/uploads/1/3/0/3/130323707/tadifaxok_kifavekiwudogok_bifopujusawebat.pdf
    • http://momentumbase.com/uploads/1/3/0/6/130604823/1473561.pdf
    • http://westcoastwaterworld.com/uploads/1/3/0/6/130604633/8c299fef.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_off000082f1.bin
0768cc5011a23fda8351213ba55d1308375cc8ee2944879f8995724a42d943f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x82F1 8472 bytes