Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bcbb761595bce3…

MALICIOUS

PDF

39.9 KB Created: 2020-03-13 07:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e29397e24c321eca989c14c71ebcace2 SHA-1: 386f1c44bc83fd61bc7214b125766d3718debfe8 SHA-256: 39bcbb761595bce315b16bdc7d142b212161e1ae397d936091da5e0c5a400a00
156 Risk Score

Malware Insights

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

The PDF_SEO_LINK_FARM heuristic and the large number of extracted URLs indicate this document functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in SEO spam. No scripts were extracted, so the exact payload delivery mechanism beyond linking is not discernible from this sample alone.

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-8948797-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8948797-0
  • 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://www.myleatherlove.com/uploads/1/3/0/6/130621801/130621801.html#apache+kafka+cluster+architecture+diagram
    • http://find-faith.com/uploads/1/3/0/2/130270977/dc9a0e89db8.pdf
    • http://eliteworkplacesolutions.net/uploads/1/3/0/9/130969441/kuxidanat.pdf
    • http://bkln-vsrv01mail.bigapplecar.com/uploads/1/3/0/5/130539107/5c856eb3.pdf
    • http://mta-sts.mx.unionvalleybaptist.net/uploads/1/3/0/5/130589020/fuxoxuvaxativiz.pdf
    • http://www.campbellriverblinds.relishinteriors.com/uploads/1/3/0/4/130435570/dizurorijulez.pdf
    • http://maritimeinvestors.com/uploads/1/3/0/4/130489530/2505294.pdf
    • http://rugcleaningrochester.info/uploads/1/3/0/6/130604473/woniriwozawuwelowuze.pdf
    • http://nicholaspaulmccarty.com/uploads/1/3/0/8/130814718/0d0bd440e795.pdf
    • http://www.vivboot.co.uk/uploads/1/3/0/3/130379219/lamam.pdf
    • http://travisfreshner.com/uploads/1/3/0/9/130969445/a4dc51a294.pdf
    • http://instathemes.com/uploads/1/3/0/6/130605186/7190150.pdf
    • http://onestaaviary.com/uploads/1/3/0/2/130289458/gebok_guziliwuzamin_nilixagom.pdf
    • http://mta-sts.mx.mymtzionumc.com/uploads/1/3/0/6/130639074/3631533.pdf
    • http://safetgrip.net/uploads/1/3/0/8/130814516/4d6256b141.pdf
    • http://turkeycreekretrievers.com/uploads/1/3/0/5/130588169/golejewepimoxe.pdf
    • http://cigarclubmodesto.com/uploads/1/3/0/7/130739212/582a431.pdf
    • http://www.kanoaphotography.com/uploads/1/3/0/4/130476101/lobuda.pdf
    • http://www.littleblessingsofanoka.com/uploads/1/3/0/7/130739769/b2580f.pdf
    • http://reseautrans.net/uploads/1/3/0/6/130604850/febozagaxor_gamekumom_sixopusumidade_kovojupaviji.pdf
    • http://frankpagani.com/uploads/1/3/0/7/130775470/sewebixolazonug.pdf
    • http://www.gbcsolutionsgroup.com/uploads/1/3/0/2/130273581/wurutaxezavos_kilasuserijuta.pdf
    • http://stickycodeit.com/uploads/1/3/0/4/130488498/sivikipafedol_zebovavarunefi_fadimomuz.pdf
    • http://synergyassistllc.com/uploads/1/3/0/7/130775862/kipepokodovama-vikagedapim-ligumosovipas-barepusesod.pdf
    • http://autumndiaries.com/uploads/1/3/0/6/130639842/larobobejim.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_off00007508.bin
3e18fafdb19e6a65fec0b7e246640e906b23156ec217057ee1b2eb837e67869e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7508 7316 bytes

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