Malicious PDF — malware analysis report

Static analysis result for SHA-256 b047dd129a798bbc…

MALICIOUS

PDF

36.4 KB Created: 2020-04-04 06:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 083c38bdb1831140454849a38383f556 SHA-1: 315a59dd0da858109568e97e702bf110f8f36e92 SHA-256: b047dd129a798bbc1946e47d02e461e4d9194ea430e013ae2b205b39f8f329a1
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. This suggests the document is intended to act as a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. 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://careaidecommunity.com/uploads/1/3/0/8/130814129/130814129.html#rca+remote+brand+code+table
    • http://signtechusa.net/uploads/1/3/0/5/130543190/8134887.pdf
    • http://journey-to-alaska-adventures.com/uploads/1/3/0/7/130739779/vapum-fopanumenara-tojugasojo-dufegis.pdf
    • http://normanreznicowod.com/uploads/1/3/0/6/130639076/danop.pdf
    • http://daytonconcretecontractors.com/uploads/1/3/0/8/130874606/e9da0745545a4c.pdf
    • http://lafayettemobilehomemovers.com/uploads/1/3/1/0/131071249/1251598.pdf
    • http://azhomeenergyaudits.com/uploads/1/3/0/7/130776340/zulitizadomew_safakam.pdf
    • http://dfpinvestments.com/uploads/1/3/0/9/130969385/kawegafined.pdf
    • http://jewelryjunkie.net/uploads/1/3/1/3/131381963/5246100.pdf
    • http://comfortsleeptest.com/uploads/1/3/0/8/130874509/1063190.pdf
    • http://edotakeout.com/uploads/1/3/0/5/130543848/3351373.pdf
    • http://youthcount2019.info/uploads/1/3/0/3/130323817/zubusat_balafibusa.pdf
    • http://copacalifornia.org/uploads/1/3/0/7/130776725/pasalax_tokedape_kuduwabetiv.pdf
    • http://thehashery.com/uploads/1/3/0/6/130639471/078800060f6.pdf
    • http://wvcofcsra.org/uploads/1/3/0/2/130287281/8684597.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_off000066c9.bin
7fc85824c43c1bfeed3fd2cb225fe64e6bec279217ab18395bf5c08ede24bf8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C9 7756 bytes

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