Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c5163d99161a0f…

MALICIOUS

PDF

33.4 KB Created: 2020-05-13 09:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bb11392628bb38984c48dc7e7e18925b SHA-1: 0ed574727f68bf69d4353f4769d5f4133f8fa05c SHA-256: 09c5163d99161a0facd20bd4dcfdde080e5e9a4026846a5ca9392a564202fcfe
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment. No scripts were extracted, but the primary attack pattern involves directing users to a network of potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://deltabravoconsulting.com/uploads/1/3/0/7/130775730/130775730.html#detroit+weather+report+today
    • http://forgeryfraud.com/uploads/1/3/0/6/130621720/pegatot-vunumozip-fajaxejakomewa.pdf
    • http://stmaryofthepinesalumniassociation.org/uploads/1/3/0/5/130550976/3806722.pdf
    • http://diypartysupply.com/uploads/1/3/1/8/131857054/c7f6da.pdf
    • http://dsgnotaryservices.com/uploads/1/3/1/4/131453206/319307.pdf
    • http://jimmydonn.com/uploads/1/3/0/6/130620494/1999853.pdf
    • http://mypaintedface.com/uploads/1/3/0/7/130775540/393c2d4ea7047.pdf
    • http://racoschb.com/uploads/1/3/0/5/130541944/7025142.pdf
    • http://beli-qymack.online/uploads/1/3/0/6/130639404/lujomave.pdf
    • http://gomastudiolabs.com/uploads/1/3/1/4/131483468/6a43b3f3e93fb.pdf
    • http://landscapesd.com/uploads/1/3/0/8/130873937/4534940.pdf
    • http://justgoldnuggets.com/uploads/1/3/0/5/130539338/4618558.pdf
    • http://taitscapes.net/uploads/1/3/1/4/131454106/xulujiwasiwilu_bulozigiji_womomosalexex_kodizatupozaru.pdf
    • http://isthegod.com/uploads/1/3/1/4/131483423/fasuziwozo.pdf
    • http://naspeltz.net/uploads/1/3/0/5/130588998/ba478e116696d.pdf
    • http://the57eatery.com/uploads/1/3/1/4/131454027/numedozojud.pdf
    • http://andrearosecimino.com/uploads/1/3/0/4/130478566/bolasopeban.pdf
    • http://photosandburritos.com/uploads/1/3/0/6/130603965/3002946.pdf
    • http://ivfamerica.com/uploads/1/3/0/2/130273980/d2b154c568.pdf
    • http://tlcrenos.com/uploads/1/3/0/9/130969229/fa4ed5eda4.pdf
    • http://journalzest.com/uploads/1/3/0/4/130489051/98cbf32ad23cb1.pdf
    • http://darlingboutique.net/uploads/1/3/0/6/130620945/621439.pdf
    • http://vickystimson.net/uploads/1/3/0/5/130540501/betadimogiroru.pdf
    • http://mistycarver.com/uploads/1/3/0/4/130476171/53106493f1018f0.pdf
    • http://justbronzeme.com/uploads/1/3/0/5/130539795/83f1b521b85ca0.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000587f.bin
6025efb1f89b4662775c3a45b764147dc0a92da781a791661c9097ff02947456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x587F 9236 bytes

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