Malicious PDF — malware analysis report

Static analysis result for SHA-256 3133d8b74163a405…

MALICIOUS

PDF

43.6 KB Created: 2020-04-02 04:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dfb8498fa2728f0cd42489be4d187bd1 SHA-1: 2958a5b1817a587e921f58f34e729832d9bdf7a5 SHA-256: 3133d8b74163a405ce3dc508e3e3d2b8c72925e2571a27c72335c59977340592
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to domains associated with SEO spam. The document body, though partially corrupted, contains text related to 'Palpacion del estomago' (stomach palpation), suggesting a lure to medical-related content. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent, likely to drive traffic to malicious or spam websites.

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://bvtems.org/uploads/1/3/0/9/130969710/130969710.html#palpacion+del+estomago
    • http://platinumclothing.org/uploads/1/3/0/4/130435794/dupawaranunosumo.pdf
    • http://mail.artofmurf.com/uploads/1/3/0/5/130543537/dujawumipagimel_rukudesugu_dekove.pdf
    • http://crowdofpeopleenterprise.com/uploads/1/3/0/9/130969725/3425778.pdf
    • http://cliccaestampaonline.store/uploads/1/3/1/4/131437147/6573023.pdf
    • http://costaricaherbalmedicine.com/uploads/1/3/0/3/130323315/nuwexukut_lufajoxuden.pdf
    • http://galleyuk.net/uploads/1/3/0/6/130621606/detezowig.pdf
    • http://greenmangoco.com/uploads/1/3/0/5/130540240/kopagojasod_bosivovo_goxemibalanu.pdf
    • http://replayacademy.org/uploads/1/3/0/9/130969212/dokakip.pdf
    • http://silverbadger.photography/uploads/1/3/0/6/130603810/banupitosox_wunoge.pdf
    • http://riversedgeknightsferry.com/uploads/1/3/0/5/130542773/visasitevojufagifex.pdf
    • http://surfsidecollies.com/uploads/1/3/0/5/130588732/51e7cfd4ca.pdf
    • http://coachoptimum.com/uploads/1/3/0/9/130969893/9d666dfe0.pdf
    • http://countingwithelliot.com/uploads/1/3/0/7/130776341/7681974.pdf
    • http://stevencombsmusic.com/uploads/1/3/0/7/130775953/8304574.pdf
    • http://nathannegri.com/uploads/1/3/0/4/130476162/a36c707d783c1.pdf
    • http://oilfreewater.org/uploads/1/3/0/8/130814083/soguvenemi.pdf
    • http://shaneglasson.com/uploads/1/3/1/4/131437535/tuguxikubawiveratu.pdf
    • http://webmail.professionalimagesf.com/uploads/1/3/1/4/131437018/6021020.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_off000083e6.bin
635f5d92636624c1c76c33264faabcad9170fec81cb0585fdabc1ce101654ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E6 7496 bytes

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