Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf619a0e8905560…

MALICIOUS

PDF

44.8 KB Created: 2020-03-23 17:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fbac83cdc05ae1c6c5e5f50b587cf8ca SHA-1: 789ee3df6c7a19e5aa152e14571a2abc28a7ed83 SHA-256: 8bf619a0e890556096a47ea3d138e908c0e291a453232feca9bc474cc17786d5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains a URL that points to a page with a similar structure to other linked PDFs. This suggests the primary purpose is to redirect users to a network of external sites, likely for SEO manipulation or to serve further malicious content. 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://makevotingmatter.net/uploads/1/3/1/1/131163514/131163514.html#ac+joint+injury+chest+workout
    • http://68ministrie.net/uploads/1/3/0/5/130551687/4688831.pdf
    • http://dianeboulanger.com/uploads/1/3/0/2/130288448/2363297.pdf
    • http://mswilliamsonline.com/uploads/1/3/0/4/130488968/5035141.pdf
    • http://chaiyee.com/uploads/1/3/0/4/130483256/3fab8999.pdf
    • http://ridgebackenterprisesllc.com/uploads/1/3/0/5/130589040/ruxenomo.pdf
    • http://gregargos.com/uploads/1/3/0/5/130550841/sazawuzekovazigutu.pdf
    • http://plasticsurgeryofnorthernvirginia.com/uploads/1/3/0/5/130547576/edd09f0ce91.pdf
    • http://ns1.papermoonjewelry.com/uploads/1/3/0/7/130738511/tekaxobutu-jenebobalam-sezer-xowusakatixujok.pdf
    • http://ldoubleux.com/uploads/1/3/0/6/130604675/1310910.pdf
    • http://www.sweetazcakes.com/uploads/1/3/0/6/130621467/ee0cf84367df7.pdf
    • http://propheticvoicerelease.net/uploads/1/3/0/7/130740123/fabem_zufajowa_mukakirusotenov_xoferuvawo.pdf
    • http://elcmt.com/uploads/1/3/0/6/130620854/8573822.pdf
    • http://createcashflowformula.com/uploads/1/3/0/6/130604335/7443160cc4.pdf
    • http://skinsoso.com/uploads/1/3/0/9/130969559/gakox.pdf
    • http://saiom.in/uploads/1/3/0/5/130590384/d4adf631c49d9b.pdf
    • http://kenbugulfilm.com/uploads/1/3/0/6/130603835/ripijevumoxaxe.pdf
    • http://jamanandavan.com/uploads/1/3/0/4/130476709/bef17cda.pdf
    • http://tashellemandic.com/uploads/1/3/0/2/130289565/64e070da682aa78.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_off0000890f.bin
9a6ac53d97a1383952f2b2d9c4b5d8b4f065b30ab3a351074c93e90f4dbddd92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890F 7336 bytes

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