Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a833120e3b0126…

MALICIOUS

PDF

63.9 KB Created: 2020-03-25 04:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f607dd31e1a4b21f76b0c633a427fb85 SHA-1: 37d2737f12e31178f75a72271e1d464c7f431f9e SHA-256: e3a833120e3b0126a58f0f433b33f3b2bf04d54a4926f790427d7ca34450b6c7
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though partially corrupted, contains references to the URLs found in the heuristics, reinforcing the link farm attack pattern.

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://nashobavalleyextractco.com/uploads/1/3/0/4/130435646/130435646.html#circuitos+electricos+dorf+6+edicion+pdf+espa%C3%B1ol
    • http://www.mysafetygown.com/uploads/1/3/0/6/130621031/080417.pdf
    • http://www.beautifiebutterflys.org/uploads/1/3/0/2/130288571/numanuxifo.pdf
    • http://morocconow1.com/uploads/1/3/0/6/130621815/9112063.pdf
    • http://e-z-cam.com/uploads/1/3/0/2/130272500/7cf555c.pdf
    • http://lunaleathers.com/uploads/1/3/0/8/130814295/gakipugisasiwilizit.pdf
    • http://votepolzin.com/uploads/1/3/0/9/130969317/8925035.pdf
    • http://itsartdyersburg.com/uploads/1/3/0/8/130874211/304138.pdf
    • http://mail.tomsdrivingschool.co.uk/uploads/1/3/0/4/130483354/zedelilo-vikakokut-rosomanotu-tamitoni.pdf
    • http://wellnessbakes.com/uploads/1/3/0/5/130588784/pidulalu-nonijonefub-loliz.pdf
    • http://mail.americanriverrehab.com/uploads/1/3/0/5/130551653/1797341.pdf
    • http://thepropertyamazon.com/uploads/1/3/0/6/130639489/dotipikakasar.pdf
    • http://www.lajewell.com/uploads/1/3/0/5/130539763/db09602.pdf
    • http://cageymooncompany.com/uploads/1/3/0/5/130590367/labad.pdf
    • http://challengefondo.com/uploads/1/3/0/2/130274109/4888805.pdf
    • http://bardristane.com/uploads/1/3/0/2/130272363/8484422.pdf
    • http://www.hungryhoundstreatsandgifts.com/uploads/1/3/0/6/130604203/juwewuxize.pdf
    • http://marwaelkadi.com/uploads/1/3/0/7/130739715/5552465.pdf
    • http://jmchocolate.com/uploads/1/3/0/8/130874354/lovasepugogig.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_off0000b2e5.bin
c15b7ab5fc8628a818708cd3ea07f5b5424b697113ddc0518e1a85d69f2a364c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E5 10812 bytes
font_01_sfnt_off0000da21.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 16036 bytes

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