Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6625a13f926e82…

MALICIOUS

PDF

51.4 KB Created: 2020-03-24 01:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee5341dfe9fb50f977402e44108bc911 SHA-1: 681d3542ca8c7545a9e7dbc62a8bd18702878c12 SHA-256: 3e6625a13f926e8253ec93de53f1cb288a1ee0c7514f2d6904105f56370087c4
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It contains a large number of external links, many of which follow a similar numeric slug pattern, suggesting a link farm or SEO manipulation tactic. The document body contains a truncated reference to 'Conclusion de trabajo practico' and lists several URLs, indicating a likely attempt to direct users to potentially harmful external content. No scripts were extracted from this sample.

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://millennialclothingllc.com/uploads/1/3/0/8/130874175/130874175.html#conclusion+de+trabajo+practico
    • http://shumateauctions.com/uploads/1/3/0/7/130776403/fonuw.pdf
    • http://littlerocktreeservices.com/uploads/1/3/1/0/131070334/d1eb9f2.pdf
    • http://laurensimkins.com/uploads/1/3/0/7/130740462/tejozujaf_lupoguboro.pdf
    • http://karenzgonc.com/uploads/1/3/0/6/130639484/e1389f33e.pdf
    • http://mdsolutions1.com/uploads/1/3/0/6/130605312/vulutinisifeda.pdf
    • http://ndr21.club/uploads/1/3/0/5/130588288/tudavubofade.pdf
    • http://kidsphilharmonic.com/uploads/1/3/0/7/130776164/e5028.pdf
    • http://fightchronicle.com/uploads/1/3/0/2/130289731/bapojoto_zelabugeme_jiwijufozune.pdf
    • http://asaircommunications.com/uploads/1/3/0/8/130814083/gufise_pudasisixafoxu_povasake.pdf
    • http://bathroomfitter.org.uk/uploads/1/3/0/3/130323693/33832b1f2da.pdf
    • http://nedwaves.com/uploads/1/3/0/7/130776247/vorevufunugojul.pdf
    • http://tylerluginski.com/uploads/1/3/0/5/130540401/22b171cb994b3.pdf
    • http://slidemountaincabins.com/uploads/1/3/0/6/130604315/fuvufexapata.pdf
    • http://cynthiastoneart.com/uploads/1/3/0/8/130874150/todemi.pdf
    • http://americanponyassociation.com/uploads/1/3/0/3/130323967/3c91364.pdf
    • http://synergydentamatrix.com/uploads/1/3/0/8/130874118/90a616c9407bebd.pdf
    • http://wheretojc.com/uploads/1/3/0/6/130639495/romumufubi.pdf
    • http://shrivelight.com/uploads/1/3/0/9/130969871/zimojuvipugeligof.pdf
    • http://artyshow.net/uploads/1/3/0/2/130270761/powovat.pdf
    • http://thehillchurch.online/uploads/1/3/0/2/130271057/jagonobotos-guverab.pdf
    • http://hostmaster.pegasusdecoratingservices.co.uk/uploads/1/3/0/5/130547576/71ba549e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bb6.bin
8af997624811212371ccc06ddc796fbb7127beb8b29db692b24bd430bf122c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB6 8696 bytes
font_01_sfnt_off00009b5f.bin
ab812997baffb44144340d8cf37c446ffa1db2460cc399ec1a0187ee9efb8300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5F 3564 bytes
font_02_sfnt_off0000a7c0.bin
3b9b8faa64425a508d4ac81dab56623964b5b9b59d79f8fe475036ec0d4c5a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C0 16292 bytes

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