Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd0401ace85fc8c…

MALICIOUS

PDF

46.0 KB Created: 2020-03-28 09:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 52dc1215770ff0ff8d16de42fbb08f10 SHA-1: 19e4bc8f3adcf91c2b1bedc232f7b60dbb7d6516 SHA-256: 7fd0401ace85fc8c54a227171029350b6533d95da9f2e78fc12d47c63791874d
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the PDF structure itself is the attack vector.

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://michaelwellsart.com/uploads/1/3/1/3/131379749/131379749.html#como+quitar+la+cuadricula+a+la+hoja+de+word
    • http://alleluiaflourishgardens.net/uploads/1/3/0/7/130739769/zapoluxuzum_newejusenufov.pdf
    • http://faefamily.com/uploads/1/3/0/3/130312961/ce47b44.pdf
    • http://jeanscarborolmhc.com/uploads/1/3/0/4/130489933/wobotevoneg.pdf
    • http://collegeofeducationsupport.com/uploads/1/3/0/2/130288533/2a8dc46.pdf
    • http://scottsdalexoticwraps.com/uploads/1/3/0/6/130603916/6952454.pdf
    • http://fuelburnrepeat.com/uploads/1/3/0/3/130323181/341b6ceb49.pdf
    • http://afp-mn.com/uploads/1/3/0/6/130639272/sosasupiwe-mikosa.pdf
    • http://roxannesloan.com/uploads/1/3/0/4/130476004/2804352.pdf
    • http://initiativeforreligiousfreedominiran.org/uploads/1/3/0/4/130483109/7021537.pdf
    • http://thearchitectsofsound.com/uploads/1/3/0/4/130489564/gerofofuwokezoxobo.pdf
    • http://crownvinyls.com/uploads/1/3/0/4/130435898/xagebefefag.pdf
    • http://plslawnmaintenance.com/uploads/1/3/0/7/130739224/4968020.pdf
    • http://metuljcki.com/uploads/1/3/0/5/130550787/wobobiwebapokon.pdf
    • http://partisanrecords.net/uploads/1/3/0/4/130477661/raverotubiwifixagufi.pdf
    • http://mauicandycompany.net/uploads/1/3/1/0/131071288/woxavutabu-rorejobu-moxuvirazoboti.pdf
    • http://www.ingridvermulst.nl/uploads/1/3/0/7/130776110/9274505.pdf
    • http://rustichomesteaddesigns.com/uploads/1/3/0/6/130604715/xajoso.pdf
    • http://www.errandboy.com.au/uploads/1/3/0/6/130620968/kudipugerufezosafo.pdf
    • http://charmedcowgirl.com/uploads/1/3/0/4/130483757/3041833.pdf
    • http://dcms-gmbh.com/uploads/1/3/0/2/130287735/926278.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_off000085d3.bin
f3b6ee6b0887de4f6e131cd76eded7a7adad2b8dba20a454d7d50ae342355d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D3 9640 bytes

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