Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b32408dbdf16442…

MALICIOUS

PDF

41.2 KB Created: 2020-03-24 21:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df0c4a88a46c9405b06900b18e3fdef0 SHA-1: 5e4a0df0f2d044b59174454426829445092081b8 SHA-256: 3b32408dbdf16442e6d023e6a9785a31bb6f36a3569b8c6ba4adf7eed10c3596
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to these external URLs, suggesting a link farm or redirection scheme. The primary goal appears to be directing users to a multitude of potentially malicious or spam-related websites.

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://naturaltolife.com/uploads/1/3/0/3/130324167/130324167.html#carpeta+de+evidencias+en+ingles
    • http://agostinodeangelis.com/uploads/1/3/0/6/130640164/kedenul_nixobup_tedijedili.pdf
    • http://driversedgrades.com/uploads/1/3/0/4/130483769/dd3919b.pdf
    • http://hempfulcolorado.com/uploads/1/3/0/4/130478935/6593706.pdf
    • http://www.usamwv.com/uploads/1/3/0/2/130287938/c2792.pdf
    • http://dominamoon.com/uploads/1/3/0/3/130323566/jewigawo.pdf
    • http://classythemes.com/uploads/1/3/1/0/131070238/847592.pdf
    • http://www.wearethreefifths.com/uploads/1/3/0/6/130621261/624569f8.pdf
    • http://www.ambrancedesigns.com/uploads/1/3/0/8/130874130/3526160.pdf
    • http://natalieelizabethseipert.com/uploads/1/3/0/7/130774972/4722788.pdf
    • http://zsseedservices.com/uploads/1/3/0/4/130435732/6414770.pdf
    • http://www.cathiejcs.com/uploads/1/3/0/4/130490915/e4b969.pdf
    • http://musings-rants.com/uploads/1/3/0/5/130541641/zojelelizuk-soximodokapopof-vuverusubabu.pdf
    • http://sundrymarketplace.net/uploads/1/3/0/6/130639160/walatefiloj_tagijidepav.pdf
    • http://cmoseleymusic.com/uploads/1/3/0/2/130289332/pazukurimo-renado-jowus-tuvese.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_off00007733.bin
b0a9838ed03d0bc22ad5e1fff7c8f8a4ec719f46314dd83322ceae395cac1366		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7733 8404 bytes

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