Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa0476f43940554…

MALICIOUS

PDF

50.8 KB Created: 2020-03-15 08:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efb5bf5d69ee4c8b25fa94b1835662d6 SHA-1: 442f7ce91694838d165962319e0e1c6c59e650fa SHA-256: 5aa0476f43940554b29687951863201db4e49e0a5bed0754acafa2df5f3744a9
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external PDF files, masquerading as an installation guide. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a large number of external links, suggesting a link farm or redirection mechanism. The primary URL http://haiyi-americaniahotel.devsite-1.com/uploads/1/3/0/8/130874123/130874123.html#kcgd506gss+installation+guide likely serves as the initial lure.

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://haiyi-americaniahotel.devsite-1.com/uploads/1/3/0/8/130874123/130874123.html#kcgd506gss+installation+guide
    • http://hostmaster.waldbaden-akademie.ch/uploads/1/3/0/5/130589124/tugalipanap.pdf
    • http://lilylives.org/uploads/1/3/0/3/130379231/doxed-pozaxeji.pdf
    • http://nourishyoullc.com/uploads/1/3/0/7/130739251/guwodejeti-jowunivew-siwuwo.pdf
    • http://merryheartmother.com/uploads/1/3/0/8/130814110/5598762.pdf
    • http://noblemobileco.com/uploads/1/3/0/4/130489696/2d7b261180.pdf
    • http://fog.markperreault.com/uploads/1/3/0/8/130874192/wexipaboj.pdf
    • http://wonderlandradionetwork.net/uploads/1/3/0/6/130620715/tufitirelexazobek.pdf
    • http://www.risingartistfestival.com/uploads/1/3/0/6/130604039/4903385.pdf
    • http://www.davidrutenberg.com/uploads/1/3/0/6/130639419/f0536410.pdf
    • http://rhythmandmovesdancestudio.com/uploads/1/3/0/9/130969592/bomuje.pdf
    • http://hostmaster.ecodiscountieper.be/uploads/1/3/0/5/130538994/76ff076cfed6cca.pdf
    • http://michelamclaurin.com/uploads/1/3/0/6/130620916/f45a800c50.pdf
    • http://vamospraorlando.com/uploads/1/3/0/4/130435990/6524104.pdf
    • http://noblesvillerugbyalumni.org/uploads/1/3/0/5/130589178/72d5f.pdf
    • http://soundmedical.org/uploads/1/3/0/5/130588847/manogamirelapagu.pdf
    • http://www.centralavenueexpress.com/uploads/1/3/0/9/130969229/fesokimo.pdf
    • http://rebecacportfolio.com/uploads/1/3/0/7/130776363/8352083.pdf
    • http://cabinetgauthiermallet.ca/uploads/1/3/0/4/130476276/femorubokiragap.pdf
    • http://pumpkinvinecafe.com/uploads/1/3/0/9/130969103/nuzizoduxunofarexor.pdf
    • http://bwellempowered.com/uploads/1/3/0/2/130271054/lewarivebubavuz-vusaxaxi-vesarogizej.pdf
    • http://mobilebillboardsredwoodcity.com/uploads/1/3/0/6/130640052/b7abfa7869.pdf
    • http://aimeegibbycoaching.com/uploads/1/3/0/4/130436018/jadobe.pdf
    • http://pttitikbaliksejahtera.org/uploads/1/3/0/7/130776864/lokerekifum.pdf
    • http://keyur-patel.com/uploads/1/3/0/8/130815140/6922571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bodriggy.cornwall.sch.uk/uploads/1/3/0/9/130969993/kepirex.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000917b.bin
d5de8fab61d7e8248644ed688fedf7a232654334588f98e88573839380d42b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x917B 10152 bytes
font_01_sfnt_off0000b4a8.bin
78116880e9c902c31767bfa12a9ff84ada309181a52ab1aa29cdf6fbfe115b45
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 2600 bytes