Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e7a7ea35399f39…

MALICIOUS

PDF

29.8 KB Created: 2020-04-04 09:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5edbdfe0db2f70f9ee98137ccf120a06 SHA-1: a5c1cffc7582030fe7ddeabb2f1c3dd74586d928 SHA-256: 16e7a7ea35399f39bed7e749c43c40a3fea8e27861875943270178bf4dd90789
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDFs, characteristic of a link farm designed to obscure malicious activity. The ML classifier strongly indicated maliciousness, and the presence of algorithmically generated URLs suggests an automated or semi-automated campaign. The document body, though partially corrupted, contains a URL that is also present in the list of external links, reinforcing the link farm attack pattern.

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://ri-joy.com/uploads/1/3/0/8/130813797/130813797.html#army+ground+guide+hand+signals+powerpoint
    • http://kevingiancolagolf.net/uploads/1/3/0/5/130588164/41e81fc635.pdf
    • http://tourprovincialgranada.com/uploads/1/3/1/3/131381963/5082667.pdf
    • http://wowfeedandsupply.com/uploads/1/3/0/5/130588319/4104934.pdf
    • http://survivalskillsforeverydayliving.com/uploads/1/3/0/7/130775786/dumakisaja.pdf
    • http://sparkysdeli.com/uploads/1/3/1/4/131483336/3906986.pdf
    • http://aaiallaroundinspections.com/uploads/1/3/0/5/130551468/28adce3c.pdf
    • http://mibfrance.com/uploads/1/3/0/5/130539155/gafudirolepeta_suloduro.pdf
    • http://pprwa.org/uploads/1/3/0/5/130539886/sesega-wilisomixipaler.pdf
    • http://welchbuilding.com/uploads/1/3/0/3/130323597/mutuliva-bilit-dugaz.pdf
    • http://asimpsonmusic.com/uploads/1/3/0/7/130740148/1171853.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_off00004d58.bin
4fb03fa2091a9b26f7d0d49bc930b67295479cdb7f53614c8a0e58dcb51cc77e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D58 7280 bytes

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