Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f9a1f12d44da51…

MALICIOUS

PDF

38.7 KB Created: 2020-03-27 11:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1fa6b59f698191b1a20136d8853b579f SHA-1: 45bff4b37184c7460ec8c21829da10db30f31191 SHA-256: 61f9a1f12d44da51ef6d8c6511c65d1aa6caa366c28a6274c8886eb50097f8ed
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF as malicious with high confidence. The embedded text 'Running on faith tablature' and the authoring application 'wkhtmltopdf' do not appear to be directly related to the malicious activity, but the numerous URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://yaredimmtratax.com/uploads/1/3/0/5/130551518/130551518.html#running+on+faith+tablature
    • http://newperspectivemedical.com/uploads/1/3/0/6/130620801/susesopimuzufid.pdf
    • http://lusoexclusive.com/uploads/1/3/0/9/130969896/84dd86c.pdf
    • http://redbolero.com/uploads/1/3/0/5/130539944/jiwumerixo.pdf
    • http://playpokeronlineforrealmoney.com/uploads/1/3/0/6/130640126/9306236.pdf
    • http://capecodrealestateandconstruction.com/uploads/1/3/0/5/130588307/mutetisakozirot.pdf
    • http://madatours.net/uploads/1/3/0/4/130483953/6088f7e61.pdf
    • http://drafttracker.net/uploads/1/3/0/7/130738991/306641975.pdf
    • http://microsoftpost.net/uploads/1/3/0/5/130545818/levajafuwibodopowix.pdf
    • http://jesusthemightygodministries.org/uploads/1/3/0/7/130775626/fosabax_zegarikoz_butakakab.pdf
    • http://generationepac.org/uploads/1/3/0/9/130969419/4821560.pdf
    • http://phenomvending.com/uploads/1/3/0/9/130969644/wuletojimidisil-mawawezitojenum-pepuzizanig-sexos.pdf
    • http://marquisdterrell.com/uploads/1/3/0/7/130739806/pomofu.pdf
    • http://copenhagen-shopping.com/uploads/1/3/0/7/130775339/subex.pdf
    • http://640stonehouseln.com/uploads/1/3/0/6/130639563/pinigi_zipovavofujobe.pdf
    • http://mx.legion22.org/uploads/1/3/0/7/130775386/dujisagiguxin_tawopamuwokenal_xetokovolosel_sisadomufoduko.pdf
    • http://ideacounselor.org/uploads/1/3/0/6/130605283/pavaganizevifuj.pdf
    • http://dmvcontractingllc.com/uploads/1/3/0/6/130620168/793de4.pdf
    • http://hostmaster.beachkick.de/uploads/1/3/0/4/130475964/najexufixos.pdf
    • http://brenda-fridman.com/uploads/1/3/0/7/130739974/gizinekovom.pdf
    • http://sunnysidekids.com/uploads/1/3/0/2/130289244/gafidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00006457.bin
5ad6b5403fca7b402846c0d1ad9f5eefc084822fc5b54e1d4602665a2b5bc204
pdf-font-stream PDF embedded font (sfnt) at offset 0x6457 8040 bytes
font_01_sfnt_off000083b9.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B9 2652 bytes