Malicious PDF — malware analysis report

Static analysis result for SHA-256 847fc1149de858e8…

MALICIOUS

PDF

41.2 KB Created: 2020-03-28 05:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 390a775c28ac2ad9681efcdb989e63c7 SHA-1: c1cbe9f1ed69e1843456a46ccee6a067a53b4a91 SHA-256: 847fc1149de858e86d4bdd8b22ac9a0c7cb08e5f0595784a1253245314506834
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are structured as SEO-friendly URLs pointing to other PDF files. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms a large number of external links, suggesting a link farm or spamming operation. The embedded document body text, while appearing to be product information, is likely a lure to disguise the malicious nature of the links.

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://ultimategutterguard.net/uploads/1/3/0/6/130605384/130605384.html#hamilton+beach+healthsmart+juice+extractor+67801
    • http://guildaware.net/uploads/1/3/0/6/130621995/8798105.pdf
    • http://formerfdainspectors.com/uploads/1/3/0/5/130551049/xixez.pdf
    • http://cpanel.minoguefurniture.com/uploads/1/3/0/6/130640102/6111037.pdf
    • http://www.detourtowonderland.com/uploads/1/3/0/7/130775831/potarodusadesa-nixedozotu-dapiwa-dogofepidotob.pdf
    • http://patricelabradorpets.com/uploads/1/3/0/7/130776246/malasopovira_lusolaratovap_fojeju.pdf
    • http://designerin-sucht-technikjob.de/uploads/1/3/0/3/130323113/remobanoxini.pdf
    • http://smutandbonbons.com/uploads/1/3/0/7/130738841/efc05.pdf
    • http://winebar.org/uploads/1/3/0/8/130813448/lewerobi.pdf
    • http://elisemichalart.com/uploads/1/3/0/5/130551920/pubizejorawa_litekajot.pdf
    • http://winningfx.net/uploads/1/3/0/6/130639326/taduberaru-xeboxos-xarebul-wapir.pdf
    • http://www.educationinequality.com/uploads/1/3/0/4/130488470/2409055.pdf
    • http://www.myplatinumtx.com/uploads/1/3/0/4/130475918/xadiz.pdf
    • http://freeflightforever.info/uploads/1/3/0/2/130274199/f1ec862d22.pdf
    • http://mrbrushgrade5.ca/uploads/1/3/0/6/130639327/favugezepavi_sowanituwugafe.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_off00007583.bin
96747e51b8100dcf955e9c9db83daa272e28537e271d2f5098647f1bdca30471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7583 8376 bytes

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