Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7cb6b92cd54862…

MALICIOUS

PDF

41.1 KB Created: 2020-04-07 14:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d16e08da8b19767310ba62b6733f2cf2 SHA-1: cae314552d013f77ca1cc6d017559534e634da4b SHA-256: ad7cb6b92cd54862fd8fbb06ce52630558fde1b6906bf1e84df684e98c5c1947
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier with high confidence. Static analysis revealed a large number of external links, many of which point to other PDF files hosted on unrelated domains, suggesting a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to children's math exercises, indicating a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://everestdobie.com/uploads/1/3/0/6/130639971/130639971.html#ejercicios+de+suma+y+resta+para+ni%C3%B1os+de+3er+grado
    • http://familylawmn.com/uploads/1/3/0/6/130621645/jebotupajova.pdf
    • http://thatdesigndiva.com/uploads/1/3/0/5/130588997/zidexaduw.pdf
    • http://eclipsestaffingsolutions.com/uploads/1/3/0/6/130621754/wiwekumowolapuw.pdf
    • http://entrepreneursover50.com/uploads/1/3/0/6/130603850/lexuti_wujedafupo_mafowij_toboxisanurusev.pdf
    • http://ddhp.org/uploads/1/3/0/4/130483617/xefaj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f17.bin
f1890efccf44a92c0fb1178a233d00c91247a3eb308ba8f14a2626a0bcd5dc2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F17 9056 bytes
font_01_sfnt_off00007fec.bin
287b852d1c1b0334c7d2ab49fe8ac8ac5488f6edefc3e00d5eee83c7048b9cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEC 16088 bytes

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