Malicious PDF — malware analysis report

Static analysis result for SHA-256 6396dabd8b2eadc1…

MALICIOUS

PDF

40.9 KB Created: 2020-03-27 01:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5ec8c125b73b284b3088ef3667940c61 SHA-1: 135ef1bb8f69bacca9a69cfc047fc2540d75278e SHA-256: 6396dabd8b2eadc16064ae22a8a3a7b8738af84e88f0cded64614d53bacf1e73
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is a PDF file that contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs likely serve to redirect users to potentially malicious websites or to manipulate search engine rankings.

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://star9communications.com/uploads/1/3/0/5/130590698/130590698.html#que+comer+para+subir+de+peso+al+bebe+en+el+embarazo
    • http://tashedynasty.com/uploads/1/3/0/6/130604806/affefb62.pdf
    • http://carolinedivine.com/uploads/1/3/0/5/130551880/tetodefex.pdf
    • http://intimaterevolution.com/uploads/1/3/0/5/130551015/vanim.pdf
    • http://my-keto-it-works.com/uploads/1/3/0/5/130538836/7acc76d1413e5e.pdf
    • http://www.ballaratchaplain.com.au/uploads/1/3/0/4/130476672/2175248.pdf
    • http://lauraelizabethphotographync.com/uploads/1/3/0/2/130288307/a26935812556.pdf
    • http://minimk.co.uk/uploads/1/3/0/5/130541641/4905844.pdf
    • http://staffordmobilehairdressers.co.uk/uploads/1/3/0/7/130740149/kupin-xatowuf.pdf
    • http://oregonpaddlequest.com/uploads/1/3/0/6/130620795/acab2a9.pdf
    • http://palosverdesplumber.net/uploads/1/3/0/4/130483725/budozugijewi.pdf
    • http://jturner122.com/uploads/1/3/0/8/130874246/35bd99a07f81f03.pdf
    • http://weneedinsurancenow.com/uploads/1/3/0/6/130621354/ravazub_basatudera_gufovozu.pdf
    • http://matthewsprange.co.uk/uploads/1/3/0/6/130604191/97c1fd93c.pdf
    • http://designsbymarie.shop/uploads/1/3/0/7/130776878/7269322.pdf
    • http://getleanin21.com/uploads/1/3/0/7/130774966/6477944.pdf
    • http://www.betterlifeloveleadership.com/uploads/1/3/0/6/130620818/sefurelodam-zasijumafoni-zabaxitaputagu.pdf
    • http://perennialfilms.org/uploads/1/3/0/6/130640145/481800.pdf
    • http://orleansluxuryrentals.com/uploads/1/3/0/7/130740092/05b564fdb7b0a.pdf
    • http://fitnessyogawheel.net/uploads/1/3/0/2/130289474/numakamofani_sagoko_tenazirajo_zojolopiwekap.pdf
    • http://www.linnakoski.com/uploads/1/3/0/6/130603683/7283109.pdf
    • http://bottomlesshole.com/uploads/1/3/0/6/130605016/5728431.pdf
    • http://www.homesteadfeedandmercantile.com/uploads/1/3/0/3/130313152/e58ab3e.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_off0000769c.bin
196cf040804d88f1a259dee92188d1abd2485982b72667f30e91c75f58ddf771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769C 8440 bytes

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