Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8b8694a9c17955…

MALICIOUS

PDF

47.4 KB Created: 2020-04-10 20:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b67a9484c79258fce942aeebe292582 SHA-1: 142a433c2ce24879db3c53afd754d8f987118f21 SHA-256: ef8b8694a9c17955c6826fe7fbb5d29fcb69d92d2a45503a0e39af6ebe81b02d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains text related to technology and network interface controllers, which may be used as a lure. The primary attack pattern involves directing users to a vast network of linked PDF documents hosted on various domains, likely for SEO spam or to distribute further malware.

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://valleyofthedunes.com/uploads/1/3/0/8/130815059/130815059.html#technology+pci+realtek+rtl8105e
    • http://emrbookings.com/uploads/1/3/0/6/130621840/3444530.pdf
    • http://jeffreyjpalmer.net/uploads/1/3/1/4/131437655/wetojepizurolup-zokenemafirax-noxazesuzafev-lopikuxuwibaz.pdf
    • http://simplytemple.com/uploads/1/3/0/4/130436513/wajijonarabi.pdf
    • http://sbzdel.com/uploads/1/3/1/4/131454556/6ccd0f3f35f.pdf
    • http://elysianintegrative.com/uploads/1/3/1/4/131438729/mugunodux_felila_megot.pdf
    • http://brookebphoto.com/uploads/1/3/0/7/130739524/5c69ad.pdf
    • http://tiffanykobbero.ca/uploads/1/3/0/3/130323567/ec2eb8bf1bd4.pdf
    • http://bsd45.org/uploads/1/3/0/7/130775950/zuvenoduto_sadupepu_jefexizavuxoni.pdf
    • http://keepyourweightoff.com/uploads/1/3/0/5/130541763/9827903.pdf
    • http://multiserviceliscasllc.com/uploads/1/3/1/4/131483282/4453650.pdf
    • http://zoey-james.com/uploads/1/3/1/3/131383018/7397840.pdf
    • http://manoliskaratarakis.website/uploads/1/3/0/7/130740174/lebigafadife-lejalosi-xebon-beripuxotajaki.pdf
    • http://drssbuffington.com/uploads/1/3/0/5/130543293/nexebefisiz-jexezekage-kijokume-zonena.pdf
    • http://eatfyb.com/uploads/1/3/0/8/130813859/5105343.pdf
    • http://madeleinelouiseart.com/uploads/1/3/0/6/130640146/kokepipegegovaxef.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_off000091cc.bin
52531674192e315eee6217e1268496fd792ac7358d42fef298603925156a0aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91CC 7860 bytes

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