Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08a12611c63d720…

MALICIOUS

PDF

41.2 KB Created: 2020-03-10 06:20:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7f600613a4bfb4376f2b61394c9e0db SHA-1: 75c73b403b51f998d74baa272002d2ffbae647e4 SHA-256: c08a12611c63d720e5f11410dad41fd7cb045d4ebb82c768d9c898fa9a353e47
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Dropper.Agent-8039309-0 and an ML classifier with a high confidence score. The PDF contains a large number of external links, many with numeric slugs, indicative of a link farm or SEO manipulation tactic. The embedded URLs point to various domains, suggesting a distribution mechanism for further malicious content or phishing pages. No scripts were extracted from this sample.

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.
  • ClamAV: Pdf.Dropper.Agent-8039309-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8039309-0
  • 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://thehappygirlstore.com/uploads/1/3/0/5/130588745/130588745.html#bartholin+gland+cyst+natural+treatment
    • http://joinsuperiorcarriers.com/uploads/1/3/0/6/130639628/lives-rokimivulo-bagareno.pdf
    • http://www.tayanaschildcare.com/uploads/1/3/0/6/130621393/sazigezopevaj_wapipuva.pdf
    • http://unkledesigns.com/uploads/1/3/0/7/130776582/7709894.pdf
    • http://nobordersadventure.voyagerwebsites.com/uploads/1/3/0/7/130739571/tujalerijajiposata.pdf
    • http://www.stellerkitchenandbath.com/uploads/1/3/0/8/130814157/9207a31f6f97.pdf
    • http://shop-dis.com/uploads/1/3/0/8/130815582/numilikolub.pdf
    • http://celiaspetsitting.com/uploads/1/3/0/7/130740553/6459411.pdf
    • http://spice-grind.com/uploads/1/3/0/5/130589293/vuzibuna.pdf
    • http://mta-sts.mail.jaynestringer.com/uploads/1/3/0/6/130639350/nejogowuwuf_refokaxab_xonalizese.pdf
    • http://www.movinion.com/uploads/1/3/0/5/130551423/8995006.pdf
    • http://freeyourmindnow.org/uploads/1/3/0/7/130739811/5748792.pdf
    • http://patiocoverideas.net/uploads/1/3/0/7/130775676/dibetase-dixeripifo-mefusijur.pdf
    • http://hostmaster.netherfieldinteriors.co.uk/uploads/1/3/0/5/130539442/vilake.pdf
    • http://ericbarlaan.com/uploads/1/3/0/9/130969499/maxumalelimo.pdf
    • http://www.goddardschoolofknoxville.com/uploads/1/3/0/7/130739778/3fd553d6119.pdf
    • http://allergy.mediutopia.com/uploads/1/3/0/4/130436197/nemoxa-saxujivu.pdf
    • http://mgmalehair.com/uploads/1/3/0/4/130436154/27aabd.pdf
    • http://admin.noc1.net/uploads/1/3/0/5/130588513/xedamalewoxuw_kozutigi_mezuval_nusesoro.pdf
    • http://mail.amiejacobsen.com/uploads/1/3/0/6/130605206/491cd75aec97b3.pdf
    • http://movietinselbuzzcentralhq.com/uploads/1/3/0/5/130551089/zefaponop-vepuleveke-vemavuxesod.pdf
    • http://triosreadydentallab.com/uploads/1/3/0/3/130313403/xiwafibiwezeb.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007827.bin
4e72e7b6b70c5240c48e8e9a92d5b671e55dea2184d9e4a8b86508b9c179b32a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7827 8172 bytes

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