Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b18c797df4dce66…

MALICIOUS

PDF

38.2 KB Created: 2020-06-12 07:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1eb6be60f6b69530931e455b99a7f22 SHA-1: b0df29495298cd8e1bc5c1e25d74478e848e4605 SHA-256: 2b18c797df4dce66f3909263c4a48c1dbda8f53461c724f57caa2ca68f6438a6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to obscure malicious content. The document body mentions 'Print to pdf free software' and 'wkhtmltopdf', likely a lure to encourage downloads. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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://hwexperience.nl/uploads/1/3/0/4/130476141/130476141.html#print+to+pdf+free+software
    • http://api.halloweencity.ca/uploads/1/3/0/6/130620249/fujigarotit-vigepowewoti-rafadojiz.pdf
    • http://marilynroyalselectronicportfolioforintegratingtechnology.com/uploads/1/3/0/4/130476130/372443.pdf
    • http://hildebrandelectric.net/uploads/1/3/0/8/130813849/safukureji.pdf
    • http://bonvoyagebazaar.net/uploads/1/3/0/2/130272361/mozivunev-zazomagapi.pdf
    • http://maineselect.com/uploads/1/3/0/5/130548152/wuzujogozunubedojaxi.pdf
    • http://rommelcativo.com/uploads/1/3/1/3/131398477/bexolusazugebi.pdf
    • http://1gb.undesirable.us/uploads/1/3/1/6/131606024/suwebevawopa.pdf
    • http://paulrorie.com/uploads/1/3/1/4/131406807/dokarebuwafusepezik.pdf
    • http://smtp1.lessoeurcieres.com/uploads/1/3/1/3/131383823/7818322.pdf
    • http://khulnavoice.com/uploads/1/3/0/3/130379509/diwugedabe_jotilanuvufok_sajunoni_xuvorolamuse.pdf
    • http://mx.fullpotentialfitness.net/uploads/1/3/0/6/130640067/82d788a9c.pdf
    • http://jakeglobox.com/uploads/1/3/0/6/130604512/46867a.pdf
    • http://lizreinertson.com/uploads/1/3/1/3/131383726/dogoguwutuguluv.pdf
    • http://designsbymygirls.com/uploads/1/3/1/0/131070144/noxipijonewivot.pdf
    • https://wivutotob.files.wordpress.com/2020/06/weruzigapidojogizunowiwo.pdf
    • https://gigepopigep.files.wordpress.com/2020/06/35106190154.pdf
    • https://wedikul.files.wordpress.com/2020/06/lilulozas.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_off00006a3e.bin
ee54f3ac3917204a03097b5bc8581a821b0f36e65da2bcb7ec6bb84841eb56db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3E 10164 bytes

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