Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ef3db4523a79a2…

MALICIOUS

PDF

29.2 KB Created: 2020-06-06 03:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 404f326a2747921f017f925bef4b9415 SHA-1: 58a7a1a3381c9b1ed41b68ff63af7a0a3116dd51 SHA-256: 14ef3db4523a79a2ad4ece77ae7d9928365de888ae232f091542ceee08bd3208
96 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links. The document body, though partially corrupted, contains text suggesting it is a 'Prentice hall health book pdf' and includes multiple URLs. These URLs are likely used to distribute malicious content or for SEO manipulation, aiming to trick users into clicking on them. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fxsol.1fx.cc/uploads/1/3/0/6/130639350/130639350.html#prentice+hall+health+book+pdf
    • http://blueharbour.org/uploads/1/3/0/2/130272084/3417928.pdf
    • http://stglashlady.club/uploads/1/3/0/4/130483213/xezasipikevemup-komewubetenib-pekanetedug.pdf
    • http://marianoshairsourceusa.com/uploads/1/3/0/5/130590403/e8dc5.pdf
    • http://mta-sts.sumacdesign.com/uploads/1/3/0/4/130489350/3399056.pdf
    • http://boxed-it.net/uploads/1/3/0/6/130620280/8982139.pdf
    • http://snchsummit.com/uploads/1/3/0/7/130740389/gizalegusa-lonux-zotaf-jenopowobevala.pdf
    • http://1200southmadison.com/uploads/1/3/0/6/130621926/1383218.pdf
    • http://danielamilinkovich.com/uploads/1/3/1/8/131857914/2713631.pdf
    • http://faithbaptistsv.org/uploads/1/3/0/7/130775867/e9c42.pdf
    • http://mta-sts.mail.heinrichtoh.com/uploads/1/3/1/8/131872149/jadabejoxux-salunibenifosa-nijeveri.pdf
    • http://wellnesstravelandtreats.com/uploads/1/3/1/4/131437307/7fd1785.pdf
    • http://fxsol.1fx.cc/uploads/1/3/0/6/130639350/terms.html
    • http://fxsol.1fx.cc/uploads/1/3/0/6/130639350/dmca.html
    • http://fxsol.1fx.cc/uploads/1/3/0/6/130639350/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://meriguni.files.wordpress.com/2020/06/gofupugokapozoludo.pdf
    • https://liletaku.files.wordpress.com/2020/06/guzuxudovam.pdf
    • https://wubewaritas.files.wordpress.com/2020/06/4991872570.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b27.bin
fe02bf8c376d57e631ba9fc81194f38b74630d431b84b9b3cdff7395b88abcac
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B27 8956 bytes