Malicious PDF — malware analysis report

Static analysis result for SHA-256 519fa13bbb23d0f9…

MALICIOUS

PDF

46.1 KB Created: 2020-03-17 01:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de9fe86ca7b28ca1afc41c056b601ab5 SHA-1: 1da40f228e161dedae3dec615ea1c1cafffb79ca SHA-256: 519fa13bbb23d0f9767db1e393e5b5e891341b2e35b4db84d4694752c5c80839
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to numerous PDF files hosted on various domains. The ML classifier also strongly indicated maliciousness. The embedded document body text, while partially corrupted, contains a URL that is also present in the list of external links. The primary attack pattern appears to be SEO poisoning or a link farm designed to redirect users to potentially malicious content hosted across many domains.

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://christinafriedle.org/uploads/1/3/0/8/130874629/130874629.html#formula+para+la+conversion+de+grados+celsius+a+kelvin
    • http://freetoridess.com/uploads/1/3/0/5/130552073/587246e50bfb.pdf
    • http://fcf�ssen.de/uploads/1/3/0/3/130324370/4092624.pdf
    • http://mta-sts.michisboutique.com/uploads/1/3/0/9/130969254/c5959165e8ce7.pdf
    • http://thedappledewe.com/uploads/1/3/0/6/130604524/gumodawarapewer.pdf
    • http://www.sayurichino.com/uploads/1/3/0/3/130313178/3719630.pdf
    • http://www.nohomoprod.com/uploads/1/3/0/7/130776158/3923097.pdf
    • http://allaymedicinal.com/uploads/1/3/0/4/130476712/c8031c4ba1f6c03.pdf
    • http://neworleans-homeinspections.com/uploads/1/3/0/7/130740163/kovafapakanokij.pdf
    • http://omugproductions.com/uploads/1/3/0/5/130589449/dironexobovu.pdf
    • http://getfitplanetusa.com/uploads/1/3/0/7/130738792/nuxijiro.pdf
    • http://stopthehategy.com/uploads/1/3/0/8/130874231/2420938.pdf
    • http://animeforthepeople.com/uploads/1/3/0/4/130483422/sifawujonozafu.pdf
    • http://sbhsladydonsgbb.com/uploads/1/3/0/4/130483207/6251362.pdf
    • http://thecakeryathens.com/uploads/1/3/0/5/130543667/zafofel.pdf
    • http://animaliadiertraining.net/uploads/1/3/0/7/130775658/ed857.pdf
    • http://www.futureenergylabs.com/uploads/1/3/0/5/130551468/e7f76c47644d8.pdf
    • http://avrahamgundle.com/uploads/1/3/0/7/130739239/df8d83eeac09c2d.pdf
    • http://virtuosoperformingartstheatre.com/uploads/1/3/0/8/130874289/wagoj_merazifedugaxo_radumame_rulesim.pdf
    • http://highcontents.com/uploads/1/3/0/5/130540609/9231894.pdf
    • http://positivelygroovy.net/uploads/1/3/0/6/130603855/f1f02adf4d81952.pdf
    • http://antonellafitness.com/uploads/1/3/0/6/130620822/4f0305.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073ec.bin
50b1328364546d91ed153e77e15afae09e2aa88a7cff7df54a5839a3a43e16cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EC 8216 bytes
font_01_sfnt_off0000923a.bin
b8d82ad245f3ab7a39d1b6c8eb253767b3a3ea96c4f9bb0949decda09a585731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x923A 16320 bytes

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